linphone::Call Class Reference

This object represents a call issued or received by the Core. More...

`#include <call.hh>`

Inheritance diagram for linphone::Call:

## Public Types

enum class | Status { Success = 0 , Aborted = 1 , Missed = 2 , Declined = 3 , EarlyAborted = 4 , AcceptedElsewhere = 5 , DeclinedElsewhere = 6 }
| Enum representing the status of a call. More...
enum class | Dir { Outgoing = 0 , Incoming = 1 }
| Enum representing the direction of a call. More...

enum class

State {
Idle = 0 ,
IncomingReceived = 1 ,
PushIncomingReceived = 2 ,
OutgoingInit = 3 ,
OutgoingProgress = 4 ,
OutgoingRinging = 5 ,
OutgoingEarlyMedia = 6 ,
Connected = 7 ,
StreamsRunning = 8 ,
Pausing = 9 ,
Paused = 10 ,
Resuming = 11 ,
Referred = 12 ,
Error = 13 ,
End = 14 ,
PausedByRemote = 15 ,
UpdatedByRemote = 16 ,
IncomingEarlyMedia = 17 ,
Updating = 18 ,
Released = 19 ,
EarlyUpdatedByRemote = 20 ,
EarlyUpdating = 21
}

| State enum represents the different states a call can reach into. More...

## Public Member Functions

LINPHONECXX_PUBLIC | Call (void *ptr, bool takeRef=true)
LINPHONECXX_PUBLIC _LinphoneCall * | cPtr ()
LINPHONECXX_PUBLIC void | addListener (const std::shared_ptr< CallListener > &listener)
| Add an application listener to the Call instance.
LINPHONECXX_PUBLIC void | removeListener (const std::shared_ptr< CallListener > &listener)
| Remove a previously added listener from the Call instance.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > | getAudioStats ()
| Returns a copy of the call statistics for the audio stream.
LINPHONECXX_PUBLIC std::string | getAuthenticationToken ()
| Returns the ZRTP authentication token to verify.
LINPHONECXX_PUBLIC bool | getAuthenticationTokenVerified () const
| Returns whether ZRTP authentication token is verified.
LINPHONECXX_PUBLIC void | setAuthenticationTokenVerified (bool verified)
| Set the result of ZRTP short code verification by user.
LINPHONECXX_PUBLIC float | getAverageQuality () const
| Returns call quality averaged over all the duration of the call.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallLog > | getCallLog () const
| Gets the call log associated to this call.
LINPHONECXX_PUBLIC bool | cameraEnabled () const
| Returns if camera pictures are allowed to be sent to the remote party.
LINPHONECXX_PUBLIC void | enableCamera (bool enabled)
| Indicate whether camera input should be sent to remote end.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::ChatRoom > | getChatRoom ()
| Create a new chat room for real time messaging from a call if not already existing, else return existing one.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Conference > | getConference () const
| Return the associated conference object.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Core > | getCore () const
| Get the core that has created the specified call.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > | getCurrentParams () const
| Returns current parameters associated to the call.
LINPHONECXX_PUBLIC float | getCurrentQuality () const
| Obtain real-time quality rating of the call.
LINPHONECXX_PUBLIC Dir | getDir () const
| Returns direction of the call (incoming or outgoing).
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > | getDiversionAddress () const
| Returns the diversion address associated to this call.
LINPHONECXX_PUBLIC int | getDuration () const
| Returns call's duration in seconds.
LINPHONECXX_PUBLIC bool | echoCancellationEnabled () const
| Returns if echo cancellation is enabled.
LINPHONECXX_PUBLIC void | enableEchoCancellation (bool enable)
| Enables or disable echo cancellation for this call.
LINPHONECXX_PUBLIC bool | echoLimiterEnabled () const
| Returns if echo limiter is enabled.
LINPHONECXX_PUBLIC void | enableEchoLimiter (bool enable)
| Enables or disable echo limiter for this call.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::ErrorInfo > | getErrorInfo () const
| Returns full details about call errors or termination reasons.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::AudioDevice > | getInputAudioDevice () const
| Gets the current input device for this call.
LINPHONECXX_PUBLIC void | setInputAudioDevice (const std::shared_ptr< linphone::AudioDevice > &audioDevice)
| Sets the given AudioDevice as input for this call only.
LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED bool | isRecording ()
| Returns whether or not the call is currently being recorded.
LINPHONECXX_PUBLIC bool | getMicrophoneMuted () const
| Get microphone muted state.
LINPHONECXX_PUBLIC void | setMicrophoneMuted (bool muted)
| Set microphone muted state.
LINPHONECXX_PUBLIC float | getMicrophoneVolumeGain () const
| Get microphone volume gain.
LINPHONECXX_PUBLIC void | setMicrophoneVolumeGain (float volume)
| Set microphone volume gain.
LINPHONECXX_PUBLIC void * | getNativeVideoWindowId () const
| Get the native window handle of the video window, casted as an unsigned long.
LINPHONECXX_PUBLIC void | setNativeVideoWindowId (void *windowId)
| Set the native video window id where the video is to be displayed.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::AudioDevice > | getOutputAudioDevice () const
| Gets the current output device for this call.
LINPHONECXX_PUBLIC void | setOutputAudioDevice (const std::shared_ptr< linphone::AudioDevice > &audioDevice)
| Sets the given AudioDevice as output for this call only.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > | getParams () const
| Returns local parameters associated with the call.
LINPHONECXX_PUBLIC void | setParams (const std::shared_ptr< const linphone::CallParams > &params)
| Set call parameters - advanced and not recommended feature - use with caution.
LINPHONECXX_PUBLIC float | getPlayVolume () const
| Get the mesured playback volume level (received from remote) in dbm0.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Player > | getPlayer ()
| Gets a player associated with the call to play a local file and stream it to the remote peer.
LINPHONECXX_PUBLIC linphone::Reason | getReason () const
| Returns the reason for a call termination (either error or normal termination).
LINPHONECXX_PUBLIC float | getRecordVolume () const
| Get the mesured record volume level (sent to remote) in dbm0.
LINPHONECXX_PUBLIC std::string | getReferTo () const
| Gets the refer-to uri (if the call was transfered).
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > | getRemoteAddress () const
| Returns the remote address associated to this call.
LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED std::string | getRemoteAddressAsString () const
| Returns the remote address associated to this call as a string.
LINPHONECXX_PUBLIC std::string | getRemoteContact ()
| Returns the far end's sip contact as a string, if available.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > | getRemoteContactAddress ()
| Returns the far end's sip contact as an address, if available.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > | getRemoteParams () const
| Returns call parameters proposed by remote.
LINPHONECXX_PUBLIC std::string | getRemoteUserAgent ()
| Returns the far end's user agent description string, if available.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > | getReplacedCall ()
| Returns the call object this call is replacing, if any.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > | getRequestAddress () const
| The address to which the call has been sent, taken directly from the SIP URI of the INVITE.
LINPHONECXX_PUBLIC bool | getSpeakerMuted () const
| Get speaker muted state.
LINPHONECXX_PUBLIC void | setSpeakerMuted (bool muted)
| Set speaker muted state.
LINPHONECXX_PUBLIC float | getSpeakerVolumeGain () const
| Get speaker volume gain.
LINPHONECXX_PUBLIC void | setSpeakerVolumeGain (float volume)
| Set speaker volume gain.
LINPHONECXX_PUBLIC State | getState () const
| Retrieves the call's current state.
LINPHONECXX_PUBLIC int | getStreamCount () const
| Returns the number of stream for the given call.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > | getTextStats ()
| Returns a copy of the call statistics for the text stream.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > | getToAddress () const
| Returns the to address with its headers associated to this call.
LINPHONECXX_PUBLIC State | getTransferState ()
| Returns the current transfer state, if a transfer has been initiated from this call.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > | getTransferTargetCall () const
| When this call has received a transfer request, returns the new call that was automatically created as a result of the transfer.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > | getTransfererCall () const
| Gets the transferer if this call was started automatically as a result of an incoming transfer request.
LINPHONECXX_PUBLIC std::shared_ptr< const linphone::VideoSourceDescriptor > | getVideoSource () const
| Gets the video source of a call.
LINPHONECXX_PUBLIC void | setVideoSource (const std::shared_ptr< const linphone::VideoSourceDescriptor > &descriptor)
| Sets the video source of a call.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > | getVideoStats ()
| Returns a copy of the call statistics for the video stream.
LINPHONECXX_PUBLIC linphone::Status | accept ()
| Accept an incoming call.
LINPHONECXX_PUBLIC linphone::Status | acceptEarlyMedia ()
| Accept an early media session for an incoming call.
LINPHONECXX_PUBLIC linphone::Status | acceptEarlyMediaWithParams (const std::shared_ptr< const linphone::CallParams > &params)
| When receiving an incoming, accept to start a media session as early-media.
LINPHONECXX_PUBLIC linphone::Status | acceptUpdate (const std::shared_ptr< const linphone::CallParams > &params)
| Accept call modifications initiated by other end.
LINPHONECXX_PUBLIC linphone::Status | acceptWithParams (const std::shared_ptr< const linphone::CallParams > &params)
| Accept an incoming call, with parameters.
LINPHONECXX_PUBLIC bool | askedToAutoanswer ()
| Tell whether a call has been asked to autoanswer.
LINPHONECXX_PUBLIC void | cancelDtmfs ()
| Stop current DTMF sequence sending.
LINPHONECXX_PUBLIC void | confirmGoClear () const
| Method to be called after the user confirm that he/she is notifed of the on going Go Clear procedure.
LINPHONECXX_PUBLIC void * | createNativeVideoWindowId () const
| Create a native video window id where the video is to be displayed.
LINPHONECXX_PUBLIC linphone::Status | decline (linphone::Reason reason)
| Decline a pending incoming call, with a reason.
LINPHONECXX_PUBLIC int | declineWithErrorInfo (const std::shared_ptr< const linphone::ErrorInfo > &ei)
| Decline a pending incoming call, with a ErrorInfo object.
LINPHONECXX_PUBLIC linphone::Status | deferUpdate ()
| When receiving a #LinphoneCallUpdatedByRemote state notification, prevent Core from performing an automatic answer.
LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > | getStats (linphone::StreamType type)
| Returns a copy of the call statistics for a particular stream type.
LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED std::string | getToHeader (const std::string &headerName) const
| Returns the value of the header name.
LINPHONECXX_PUBLIC bool | hasTransferPending () const
| Returns if this calls has received a transfer that has not been executed yet.
LINPHONECXX_PUBLIC bool | mediaInProgress () const
| Indicates whether an operation is in progress at the media side.
LINPHONECXX_PUBLIC void | notifyRinging ()
| Starts the process of replying 180 Ringing.
LINPHONECXX_PUBLIC void | oglRender () const
| Calls generic OpenGL render for a given call.
LINPHONECXX_PUBLIC linphone::Status | pause ()
| Pauses the call.
LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED linphone::Status | redirect (const std::string &redirectUri)
| Redirect the specified call to the given redirect URI.
LINPHONECXX_PUBLIC linphone::Status | redirectTo (const std::shared_ptr< linphone::Address > &redirectAddress)
| Redirect the specified call to the given redirect Address.
LINPHONECXX_PUBLIC void | requestNotifyNextVideoFrameDecoded ()
| Request the callback passed to linphone_call_cbs_set_next_video_frame_decoded to be called the next time the video decoder properly decodes a video frame.
LINPHONECXX_PUBLIC linphone::Status | resume ()
| Resumes a call.
LINPHONECXX_PUBLIC linphone::Status | sendDtmf (char dtmf)
| Send the specified dtmf.
LINPHONECXX_PUBLIC linphone::Status | sendDtmfs (const std::string &dtmfs)
| Send a list of dtmf.
LINPHONECXX_PUBLIC linphone::Status | sendInfoMessage (const std::shared_ptr< const linphone::InfoMessage > &info)
| Sends an info message through an established call.
LINPHONECXX_PUBLIC void | sendVfuRequest ()
| Request remote side to send us a Video Fast Update.
LINPHONECXX_PUBLIC void | startRecording ()
| Starts call recording.
LINPHONECXX_PUBLIC void | stopRecording ()
| Stops call recording.
LINPHONECXX_PUBLIC linphone::Status | takePreviewSnapshot (const std::string &filePath)
| Take a photo of currently captured video and write it into a jpeg file.
LINPHONECXX_PUBLIC linphone::Status | takeVideoSnapshot (const std::string &filePath)
| Take a photo of currently received video and write it into a jpeg file.
LINPHONECXX_PUBLIC linphone::Status | terminate ()
| Terminates a call.
LINPHONECXX_PUBLIC linphone::Status | terminateWithErrorInfo (const std::shared_ptr< const linphone::ErrorInfo > &ei)
| Terminates a call.
LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED linphone::Status | transfer (const std::string &referTo)
| Performs a simple call transfer to the specified destination.
LINPHONECXX_PUBLIC linphone::Status | transferTo (const std::shared_ptr< linphone::Address > &referTo)
| Performs a simple call transfer to the specified destination.
LINPHONECXX_PUBLIC linphone::Status | transferToAnother (const std::shared_ptr< linphone::Call > &dest)
| Transfers a call to destination of another running call.
LINPHONECXX_PUBLIC linphone::Status | update (const std::shared_ptr< const linphone::CallParams > &params)
| Updates a running call according to supplied call parameters or parameters changed in the Core.
LINPHONECXX_PUBLIC void | zoom (float zoomFactor, float cx, float cy)
| Perform a zoom of the video displayed during a call.

## Detailed Description

This object represents a call issued or received by the Core.

Linphone only allows at most one active call at any given time and it will be in State::StreamsRunning. However, if the core is locally hosting a Conference, you may have some or all the calls in the conference in State::StreamsRunning as well as an additional active call outside of the conference in State::StreamsRunning if the local participant of the Conference is not part of it. You can get the State of the call using getState(), it's current CallParams with getCurrentParams() and the latest statistics by calling getAudioStats() or getVideoStats().

## Member Enumeration Documentation

## Dir

enum class linphone::Call::Dir

strong

Enum representing the direction of a call.

Enumerator
Outgoing | outgoing calls
Incoming | incoming calls

## State

enum class linphone::Call::State

strong

State enum represents the different states a call can reach into.

Enumerator
Idle | Initial state.
IncomingReceived | Incoming call received.
PushIncomingReceived | PushIncoming call received.
OutgoingInit | Outgoing call initialized.
OutgoingProgress | Outgoing call in progress.
OutgoingRinging | Outgoing call ringing.
OutgoingEarlyMedia | Outgoing call early media.
Connected | Connected.
StreamsRunning | Streams running.
Pausing | Pausing.
Paused | Paused.
Resuming | Resuming.
Referred | Referred.
Error | Error.
End | Call end.
PausedByRemote | Paused by remote.
UpdatedByRemote | The call's parameters are updated for example when video is asked by remote.
IncomingEarlyMedia | We are proposing early media to an incoming call.
Updating | We have initiated a call update.
Released | The call object is now released.
EarlyUpdatedByRemote | The call is updated by remote while not yet answered (SIP UPDATE in early dialog received).
EarlyUpdating | We are updating the call while not yet answered (SIP UPDATE in early dialog sent).

## Status

enum class linphone::Call::Status

strong

Enum representing the status of a call.

Enumerator
Success | The call was sucessful.
Aborted | The call was aborted (caller hanged up).
Missed | The call was missed (incoming call timed out without being answered or hanged up).
Declined | The call was declined, either locally or by remote end.
EarlyAborted | The call was aborted before being advertised to the application - for protocol reasons.
AcceptedElsewhere | The call was answered on another device.
DeclinedElsewhere | The call was declined on another device.

## Member Function Documentation

## accept()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::accept | ( |  | ) |

Accept an incoming call.

Basically the application is notified of incoming calls within the call_state_changed callback of the LinphoneCoreVTable structure, where it will receive a Dir::Incoming event with the associated Call object. The application can later accept the call using this method.

Returns
  0 on success, -1 on failure

## acceptEarlyMedia()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::acceptEarlyMedia | ( |  | ) |

Accept an early media session for an incoming call.

This is identical as calling acceptEarlyMediaWithParams() with nullptr parameters.

Returns
  0 if successful, -1 otherwise

See also
  acceptEarlyMediaWithParams()

## acceptEarlyMediaWithParams()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::acceptEarlyMediaWithParams | ( | const std::shared_ptr< const linphone::CallParams > & | params | ) |

When receiving an incoming, accept to start a media session as early-media.

This means the call is not accepted but audio & video streams can be established if the remote party supports early media. However, unlike after call acceptance, mic and camera input are not sent during early-media, though received audio & video are played normally. The call can then later be fully accepted using accept() or acceptWithParams().

Parameters

  params | The call parameters to use (can be nullptr).

Returns
  0 if successful, -1 otherwise

## acceptUpdate()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::acceptUpdate | ( | const std::shared_ptr< const linphone::CallParams > & | params | ) |

Accept call modifications initiated by other end.

This call may be performed in response to a #LinphoneCallUpdatedByRemote state notification. When such notification arrives, the application can decide to call deferUpdate() so that it can have the time to prompt the user. getRemoteParams() can be used to get information about the call parameters requested by the other party, such as whether a video stream is requested. When the user accepts or refuse the change, acceptUpdate() can be done to answer to the other party. If params is nullptr, then the same call parameters established before the update request will continue to be used (no change). If params is not nullptr, then the update will be accepted according to the parameters passed. Typical example is when a user accepts to start video, then params should indicate that video stream should be used (see CallParams::enableVideo()).

Parameters

  params | A CallParams object describing the call parameters to accept.

Returns
  0 if successful, -1 otherwise (actually when this function call is performed outside ot #LinphoneCallUpdatedByRemote state)

## acceptWithParams()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::acceptWithParams | ( | const std::shared_ptr< const linphone::CallParams > & | params | ) |

Accept an incoming call, with parameters.

Basically the application is notified of incoming calls within the call_state_changed callback of the LinphoneCoreVTable structure, where it will receive a Dir::Incoming event with the associated Call object. The application can later accept the call using this method.

Parameters

  params | The specific parameters for this call, for example whether video is accepted or not. Use nullptr to use default parameters.

Returns
  0 on success, -1 on failure

## addListener()

LINPHONECXX_PUBLIC void linphone::Call::addListener | ( | const std::shared_ptr< CallListener > & | listener | ) |

Add an application listener to the Call instance.

Parameters

  listener | the application listener

## askedToAutoanswer()

LINPHONECXX_PUBLIC bool linphone::Call::askedToAutoanswer | ( |  | ) |

Tell whether a call has been asked to autoanswer.

Returns
  A boolean value telling whether the call has been asked to autoanswer

## cameraEnabled()

LINPHONECXX_PUBLIC bool linphone::Call::cameraEnabled | ( |  | ) | const

Returns if camera pictures are allowed to be sent to the remote party.

Returns
  true if local video stream is being sent, false otherwise.

## cancelDtmfs()

LINPHONECXX_PUBLIC void linphone::Call::cancelDtmfs | ( |  | ) |

Stop current DTMF sequence sending.

Please note that some DTMF could be already sent, depending on when this function call is delayed from sendDtmfs(). This function will be automatically called if call state change to anything but LinphoneCallStreamsRunning.

## confirmGoClear()

LINPHONECXX_PUBLIC void linphone::Call::confirmGoClear | ( |  | ) | const

Method to be called after the user confirm that he/she is notifed of the on going Go Clear procedure.

Warning
  this operation must be imperatevely initiate by a user action on sending of the GoClear ACK

## createNativeVideoWindowId()

LINPHONECXX_PUBLIC void * linphone::Call::createNativeVideoWindowId | ( |  | ) | const

Create a native video window id where the video is to be displayed.

Returns
  the native video window id (type may vary depending on platform).

## decline()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::decline | ( | linphone::Reason | reason | ) |

Decline a pending incoming call, with a reason.

Parameters

  reason | The reason for rejecting the call: Reason::Declined or Reason::Busy

Returns
  0 on success, -1 on failure

## declineWithErrorInfo()

LINPHONECXX_PUBLIC int linphone::Call::declineWithErrorInfo | ( | const std::shared_ptr< const linphone::ErrorInfo > & | ei | ) |

Decline a pending incoming call, with a ErrorInfo object.

Parameters

  ei | ErrorInfo containing more information on the call rejection.

Returns
  0 on success, -1 on failure

## deferUpdate()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::deferUpdate | ( |  | ) |

When receiving a #LinphoneCallUpdatedByRemote state notification, prevent Core from performing an automatic answer.

When receiving a #LinphoneCallUpdatedByRemote state notification (ie an incoming reINVITE), the default behaviour of Core is defined by the "defer_update_default" option of the "sip" section of the config. If this option is 0 (the default) then the Core automatically answers the reINIVTE with call parameters unchanged. However when for example when the remote party updated the call to propose a video stream, it can be useful to prompt the user before answering. This can be achieved by calling linphone_core_defer_call_update during the call state notification, to deactivate the automatic answer that would just confirm the audio but reject the video. Then, when the user responds to dialog prompt, it becomes possible to call acceptUpdate() to answer the reINVITE, with eventually video enabled in the CallParams argument. The #LinphoneCallUpdatedByRemote notification can also arrive when receiving an INVITE without SDP. In such case, an unchanged offer is made in the 200Ok, and when the ACK containing the SDP answer is received, #LinphoneCallUpdatedByRemote is triggered to notify the application of possible changes in the media session. However in such case defering the update has no meaning since we just generating an offer.

Returns
  0 if successful, -1 if the deferUpdate() was done outside a valid #LinphoneCallUpdatedByRemote notification

## echoCancellationEnabled()

LINPHONECXX_PUBLIC bool linphone::Call::echoCancellationEnabled | ( |  | ) | const

Returns if echo cancellation is enabled.

Returns
  true if echo cancellation is enabled, false otherwise.

## echoLimiterEnabled()

LINPHONECXX_PUBLIC bool linphone::Call::echoLimiterEnabled | ( |  | ) | const

Returns if echo limiter is enabled.

Returns
  true if echo limiter is enabled, false otherwise.

## enableCamera()

LINPHONECXX_PUBLIC void linphone::Call::enableCamera | ( | bool | enabled | ) |

Indicate whether camera input should be sent to remote end.

Parameters

  enabled | wether or not to send local video stream.

## enableEchoCancellation()

LINPHONECXX_PUBLIC void linphone::Call::enableEchoCancellation | ( | bool | enable | ) |

Enables or disable echo cancellation for this call.

Parameters

  enable | wether to enable echo cancellation or not.

## enableEchoLimiter()

LINPHONECXX_PUBLIC void linphone::Call::enableEchoLimiter | ( | bool | enable | ) |

Enables or disable echo limiter for this call.

Parameters

  enable | wether to enable echo limiter or not.

## getAudioStats()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > linphone::Call::getAudioStats | ( |  | ) |

Returns a copy of the call statistics for the audio stream.

Returns
  a CallStats object for the audio stream or nullptr if it isn't available.

## getAuthenticationToken()

LINPHONECXX_PUBLIC std::string linphone::Call::getAuthenticationToken | ( |  | ) |

Returns the ZRTP authentication token to verify.

Returns
  the authentication token to verify or nullptr if ZRTP isn't enabled.

## getAuthenticationTokenVerified()

LINPHONECXX_PUBLIC bool linphone::Call::getAuthenticationTokenVerified | ( |  | ) | const

Returns whether ZRTP authentication token is verified.

If not, it must be verified by users as described in ZRTP procedure. Once done, the application must inform of the results with setAuthenticationTokenVerified().

Returns
  true if authentication token is verifed, false otherwise.

## getAverageQuality()

LINPHONECXX_PUBLIC float linphone::Call::getAverageQuality | ( |  | ) | const

Returns call quality averaged over all the duration of the call.

See getCurrentQuality() for more details about quality measurement.

Returns
  the call average quality since tbe beginning of the call.

## getCallLog()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallLog > linphone::Call::getCallLog | ( |  | ) | const

Gets the call log associated to this call.

Returns
  The CallLog associated with the specified Call.

## getChatRoom()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::ChatRoom > linphone::Call::getChatRoom | ( |  | ) |

Create a new chat room for real time messaging from a call if not already existing, else return existing one.

No reference is given to the caller: the chat room will be deleted when the call is ended.

Returns
  ChatRoom where real time messaging can take place or nullptr if chat room couldn't be created.

## getConference()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Conference > linphone::Call::getConference | ( |  | ) | const

Return the associated conference object.

Returns
  A pointer on Conference or nullptr if the call is not part of any conference.

## getCore()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Core > linphone::Call::getCore | ( |  | ) | const

Get the core that has created the specified call.

Returns
  The Core object that has created the specified call.

## getCurrentParams()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > linphone::Call::getCurrentParams | ( |  | ) | const

Returns current parameters associated to the call.

Returns
  the current CallParams of this call.

## getCurrentQuality()

LINPHONECXX_PUBLIC float linphone::Call::getCurrentQuality | ( |  | ) | const

Obtain real-time quality rating of the call.

Based on local RTP statistics and RTCP feedback, a quality rating is computed and updated during all the duration of the call. This function returns its value at the time of the function call. It is expected that the rating is updated at least every 5 seconds or so. The rating is a floating point number comprised between 0 and 5. 4-5 = good quality 3-4 = average quality 2-3 = poor quality 1-2 = very poor quality 0-1 = can't be worse, mostly unusable

Returns
  The function returns -1 if no quality measurement is available, for example if no active audio stream exist. Otherwise it returns the quality rating.

## getDir()

LINPHONECXX_PUBLIC Dir linphone::Call::getDir | ( |  | ) | const

Returns direction of the call (incoming or outgoing).

Returns
  the Dir

## getDiversionAddress()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > linphone::Call::getDiversionAddress | ( |  | ) | const

Returns the diversion address associated to this call.

Returns
  the diversion address as Address or nullptr.

## getDuration()

LINPHONECXX_PUBLIC int linphone::Call::getDuration | ( |  | ) | const

Returns call's duration in seconds.

Returns
  the call's duration in seconds.

## getErrorInfo()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::ErrorInfo > linphone::Call::getErrorInfo | ( |  | ) | const

Returns full details about call errors or termination reasons.

Returns
  ErrorInfo object holding the reason error.

## getInputAudioDevice()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::AudioDevice > linphone::Call::getInputAudioDevice | ( |  | ) | const

Gets the current input device for this call.

Returns
  the AudioDevice used by this call as input or nullptr if there is currently no soundcard configured (depending on the state of the call)

## getMicrophoneMuted()

LINPHONECXX_PUBLIC bool linphone::Call::getMicrophoneMuted | ( |  | ) | const

Get microphone muted state.

Note that the microphone may be disabled globally if false was given to Core::enableMic().

Returns
  The microphone muted state.

Warning
  This method returns state of the mute capability of the call passed as argument. If this call is part of a conference, it is strongly recommended to call Conference::getMicrophoneMuted() to know whether this device is muted or not.

## getMicrophoneVolumeGain()

LINPHONECXX_PUBLIC float linphone::Call::getMicrophoneVolumeGain | ( |  | ) | const

Get microphone volume gain.

If the sound backend supports it, the returned gain is equal to the gain set with the system mixer.

Returns
  double Percentage of the max supported volume gain. Valid values are in [ 0.0 : 1.0 ]. In case of failure, a negative value is returned

## getNativeVideoWindowId()

LINPHONECXX_PUBLIC void * linphone::Call::getNativeVideoWindowId | ( |  | ) | const

Get the native window handle of the video window, casted as an unsigned long.

Returns
  the native video window id (type may vary depending on platform).

## getOutputAudioDevice()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::AudioDevice > linphone::Call::getOutputAudioDevice | ( |  | ) | const

Gets the current output device for this call.

Returns
  the AudioDevice used by this call as output or nullptr if there is currently no soundcard configured (depending on the state of the call)

## getParams()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > linphone::Call::getParams | ( |  | ) | const

Returns local parameters associated with the call.

This is typically the parameters passed at call initiation to Core::inviteAddressWithParams() or acceptWithParams(), or some default parameters if no CallParams was explicitely passed during call initiation.

Returns
  the call's local parameters.

## getPlayer()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Player > linphone::Call::getPlayer | ( |  | ) |

Gets a player associated with the call to play a local file and stream it to the remote peer.

Returns
  A Player object

## getPlayVolume()

LINPHONECXX_PUBLIC float linphone::Call::getPlayVolume | ( |  | ) | const

Get the mesured playback volume level (received from remote) in dbm0.

Returns
  float Volume level in percentage.

## getReason()

LINPHONECXX_PUBLIC linphone::Reason linphone::Call::getReason | ( |  | ) | const

Returns the reason for a call termination (either error or normal termination).

Returns
  the Reason of the call termination.

## getRecordVolume()

LINPHONECXX_PUBLIC float linphone::Call::getRecordVolume | ( |  | ) | const

Get the mesured record volume level (sent to remote) in dbm0.

Returns
  float Volume level in percentage.

## getReferTo()

LINPHONECXX_PUBLIC std::string linphone::Call::getReferTo | ( |  | ) | const

Gets the refer-to uri (if the call was transfered).

Returns
  The refer-to uri of the call (if it was transfered).

## getRemoteAddress()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > linphone::Call::getRemoteAddress | ( |  | ) | const

Returns the remote address associated to this call.

Returns
  The Address of the remote end of the call.

## getRemoteAddressAsString()

LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED std::string linphone::Call::getRemoteAddressAsString | ( |  | ) | const

Returns the remote address associated to this call as a string.

The result string must be freed by user using ms_free().

Returns
  the remote address as a string.

Deprecated
  06/07/2020 use getRemoteAddress() instead.

## getRemoteContact()

LINPHONECXX_PUBLIC std::string linphone::Call::getRemoteContact | ( |  | ) |

Returns the far end's sip contact as a string, if available.

Returns
  the remote contact or nullptr.

## getRemoteContactAddress()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > linphone::Call::getRemoteContactAddress | ( |  | ) |

Returns the far end's sip contact as an address, if available.

Returns
  the remote contact as a Address or nullptr.

## getRemoteParams()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::CallParams > linphone::Call::getRemoteParams | ( |  | ) | const

Returns call parameters proposed by remote.

This is useful when receiving an incoming call, to know whether the remote party supports video, encryption or whatever.

Returns
  the CallParams suggested by the remote or nullptr.

## getRemoteUserAgent()

LINPHONECXX_PUBLIC std::string linphone::Call::getRemoteUserAgent | ( |  | ) |

Returns the far end's user agent description string, if available.

Returns
  the remote user agent or nullptr.

## getReplacedCall()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > linphone::Call::getReplacedCall | ( |  | ) |

Returns the call object this call is replacing, if any.

Call replacement can occur during call transfers. By default, the core automatically terminates the replaced call and accept the new one. This function allows the application to know whether a new incoming call is a one that replaces another one.

Returns
  the Call object this call is replacing or nullptr.

## getRequestAddress()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > linphone::Call::getRequestAddress | ( |  | ) | const

The address to which the call has been sent, taken directly from the SIP URI of the INVITE.

Usually equal to the To field, except when e.g. using a fallback contact address. You should probably use getToAddress() instead, unless you know what you're doing.

Returns
  the Address matching the URI of the INVITE request.

## getSpeakerMuted()

LINPHONECXX_PUBLIC bool linphone::Call::getSpeakerMuted | ( |  | ) | const

Get speaker muted state.

Returns
  The speaker muted state.

## getSpeakerVolumeGain()

LINPHONECXX_PUBLIC float linphone::Call::getSpeakerVolumeGain | ( |  | ) | const

Get speaker volume gain.

If the sound backend supports it, the returned gain is equal to the gain set with the system mixer.

Returns
  Percentage of the max supported volume gain. Valid values are in [ 0.0 : 1.0 ]. In case of failure, a negative value is returned

## getState()

LINPHONECXX_PUBLIC State linphone::Call::getState | ( |  | ) | const

Retrieves the call's current state.

Returns
  the current State of this call.

## getStats()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > linphone::Call::getStats | ( | linphone::StreamType | type | ) |

Returns a copy of the call statistics for a particular stream type.

Parameters

  type | the StreamType

Returns
  a CallStats object for the given stream or nullptr if stream isn't available.

## getStreamCount()

LINPHONECXX_PUBLIC int linphone::Call::getStreamCount | ( |  | ) | const

Returns the number of stream for the given call.

Returns
  the amount of streams for this call.

## getTextStats()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > linphone::Call::getTextStats | ( |  | ) |

Returns a copy of the call statistics for the text stream.

Returns
  a CallStats object for the text stream or nullptr if it isn't available.

## getToAddress()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::Address > linphone::Call::getToAddress | ( |  | ) | const

Returns the to address with its headers associated to this call.

Returns
  the Address matching the TO of the call.

## getToHeader()

LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED std::string linphone::Call::getToHeader | ( | const std::string & | headerName | ) | const

Returns the value of the header name.

Parameters

  headerName | the name of the header to check.

Returns
  the value of the header if exists.

Deprecated
  27/10/2020. Use CallParams::getCustomHeader() on getRemoteParams() instead.

## getTransfererCall()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > linphone::Call::getTransfererCall | ( |  | ) | const

Gets the transferer if this call was started automatically as a result of an incoming transfer request.

The call in which the transfer request was received is returned in this case.

Returns
  The transferer Call if the specified call was started automatically as a result of an incoming transfer request, nullptr otherwise.

## getTransferState()

LINPHONECXX_PUBLIC State linphone::Call::getTransferState | ( |  | ) |

Returns the current transfer state, if a transfer has been initiated from this call.

See also
  linphone_core_transfer_call , linphone_core_transfer_call_to_another

Returns
  the State.

## getTransferTargetCall()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::Call > linphone::Call::getTransferTargetCall | ( |  | ) | const

When this call has received a transfer request, returns the new call that was automatically created as a result of the transfer.

Returns
  the transfer Call created.

## getVideoSource()

LINPHONECXX_PUBLIC std::shared_ptr< const linphone::VideoSourceDescriptor > linphone::Call::getVideoSource | ( |  | ) | const

Gets the video source of a call.

Returns
  The VideoSourceDescriptor describing the video source that is set

## getVideoStats()

LINPHONECXX_PUBLIC std::shared_ptr< linphone::CallStats > linphone::Call::getVideoStats | ( |  | ) |

Returns a copy of the call statistics for the video stream.

Returns
  a CallStats object for the video stream or nullptr if it isn't available.

## hasTransferPending()

LINPHONECXX_PUBLIC bool linphone::Call::hasTransferPending | ( |  | ) | const

Returns if this calls has received a transfer that has not been executed yet.

Pending transfers are executed when this call is being paused or closed, locally or by remote endpoint. If the call is already paused while receiving the transfer request, the transfer immediately occurs.

Returns
  true if transfer is pending, false otherwise.

## isRecording()

LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED bool linphone::Call::isRecording | ( |  | ) |

Returns whether or not the call is currently being recorded.

Returns
  true if recording is in progress, false otherwise

Deprecated
  15/09/2021 Use CallParams::isRecording() instead.

## mediaInProgress()

LINPHONECXX_PUBLIC bool linphone::Call::mediaInProgress | ( |  | ) | const

Indicates whether an operation is in progress at the media side.

It can be a bad idea to initiate signaling operations (adding video, pausing the call, removing video, changing video parameters) while the media is busy in establishing the connection (typically ICE connectivity checks). It can result in failures generating loss of time in future operations in the call. Applications are invited to check this function after each call state change to decide whether certain operations are permitted or not.

Returns
  true if media is busy in establishing the connection, false otherwise.

## notifyRinging()

LINPHONECXX_PUBLIC void linphone::Call::notifyRinging | ( |  | ) |

Starts the process of replying 180 Ringing.

This function is used in conjonction with Core::enableAutoSendRinging(). If the automatic sending of the 180 Ringing is disabled, this function needs to be called manually before the call timeouts.

## pause()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::pause | ( |  | ) |

Pauses the call.

If a music file has been setup using Core::setPlayFile(), this file will be played to the remote user. The only way to resume a paused call is to call resume().

Returns
  0 on success, -1 on failure

See also
  resume()

## redirect()

LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED linphone::Status linphone::Call::redirect | ( | const std::string & | redirectUri | ) |

Redirect the specified call to the given redirect URI.

Parameters

  redirectUri | The URI to redirect the call to

Returns
  0 if successful, -1 on error.

Deprecated
  27/10/2020. Use redirectTo() instead.

## redirectTo()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::redirectTo | ( | const std::shared_ptr< linphone::Address > & | redirectAddress | ) |

Redirect the specified call to the given redirect Address.

Parameters

  redirectAddress | The Address to redirect the call to

Returns
  0 if successful, -1 on error.

## removeListener()

LINPHONECXX_PUBLIC void linphone::Call::removeListener | ( | const std::shared_ptr< CallListener > & | listener | ) |

Remove a previously added listener from the Call instance.

Parameters

  listener | the application listener

## resume()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::resume | ( |  | ) |

Resumes a call.

The call needs to have been paused previously with pause().

Returns
  0 on success, -1 on failure

See also
  pause()

## sendDtmf()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::sendDtmf | ( | char | dtmf | ) |

Send the specified dtmf.

The dtmf is automatically played to the user.

Parameters

  dtmf | The dtmf name specified as a char, such as '0', '#' etc...

Returns
  0 if successful, -1 on error.

## sendDtmfs()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::sendDtmfs | ( | const std::string & | dtmfs | ) |

Send a list of dtmf.

The dtmfs are automatically sent to remote, separated by some needed customizable delay. Sending is canceled if the call state changes to something not LinphoneCallStreamsRunning.

Parameters

  dtmfs | A dtmf sequence such as '123#123123'

Returns
  -2 if there is already a DTMF sequence, -1 if call is not ready, 0 otherwise.

## sendInfoMessage()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::sendInfoMessage | ( | const std::shared_ptr< const linphone::InfoMessage > & | info | ) |

Sends an info message through an established call.

Parameters

  info | the InfoMessage to send

## setAuthenticationTokenVerified()

LINPHONECXX_PUBLIC void linphone::Call::setAuthenticationTokenVerified | ( | bool | verified | ) |

Set the result of ZRTP short code verification by user.

If remote party also does the same, it will update the ZRTP cache so that user's verification will not be required for the two users.

Parameters

  verified | whether the ZRTP SAS is verified.

## setInputAudioDevice()

LINPHONECXX_PUBLIC void linphone::Call::setInputAudioDevice | ( | const std::shared_ptr< linphone::AudioDevice > & | audioDevice | ) |

Sets the given AudioDevice as input for this call only.

Parameters

  audioDevice | The AudioDevice. nullptr does nothing.

## setMicrophoneMuted()

LINPHONECXX_PUBLIC void linphone::Call::setMicrophoneMuted | ( | bool | muted | ) |

Set microphone muted state.

The boolean value given is applied logical-and with the value given to Core::enableMic().

Parameters

  muted | The microphone muted state.

Warning
  This method only mutes the call passed as argument. If this call is part of a conference, it is strongly recommended to call Conference::setMicrophoneMuted() to ensure that the setting is correctly apply across all participants and the conference callbacks are called.

## setMicrophoneVolumeGain()

LINPHONECXX_PUBLIC void linphone::Call::setMicrophoneVolumeGain | ( | float | volume | ) |

Set microphone volume gain.

If the sound backend supports it, the new gain will synchronized with the system mixer.

Parameters

  volume | Percentage of the max supported gain. Valid values are in [ 0.0 : 1.0 ].

## setNativeVideoWindowId()

LINPHONECXX_PUBLIC void linphone::Call::setNativeVideoWindowId | ( | void * | windowId | ) |

Set the native video window id where the video is to be displayed.

For MacOS, Linux, Windows: if not set or 0 a window will be automatically created, unless the special id -1 is given.

Parameters

  windowId | the native video window id.

## setOutputAudioDevice()

LINPHONECXX_PUBLIC void linphone::Call::setOutputAudioDevice | ( | const std::shared_ptr< linphone::AudioDevice > & | audioDevice | ) |

Sets the given AudioDevice as output for this call only.

Parameters

  audioDevice | The AudioDevice. nullptr does nothing.

## setParams()

LINPHONECXX_PUBLIC void linphone::Call::setParams | ( | const std::shared_ptr< const linphone::CallParams > & | params | ) |

Set call parameters - advanced and not recommended feature - use with caution.

Local call parameters applicable to an outgoing or incoming shall usually be passed to Core::inviteAddressWithParams() or acceptWithParams(). However, in some cases it might be desirable from a software design standpoint to modify local parameters outside of the application layer, typically in the purpose of implementing a custom logic including special headers in INVITE or 200Ok requests, driven by a call_state_changed listener method. This function accepts to assign a new CallParams only in #LinphoneCallOutgoingInit and #LinphoneCallIncomingReceived states.

Parameters

  params | the CallParams object

## setSpeakerMuted()

LINPHONECXX_PUBLIC void linphone::Call::setSpeakerMuted | ( | bool | muted | ) |

Set speaker muted state.

Parameters

  muted | The speaker muted state.

## setSpeakerVolumeGain()

LINPHONECXX_PUBLIC void linphone::Call::setSpeakerVolumeGain | ( | float | volume | ) |

Set speaker volume gain.

If the sound backend supports it, the new gain will synchronized with the system mixer.

Parameters

  volume | Percentage of the max supported gain. Valid values are in [ 0.0 : 1.0 ].

## setVideoSource()

LINPHONECXX_PUBLIC void linphone::Call::setVideoSource | ( | const std::shared_ptr< const linphone::VideoSourceDescriptor > & | descriptor | ) |

Sets the video source of a call.

Parameters

  descriptor | The VideoSourceDescriptor describing the video source to set

## startRecording()

LINPHONECXX_PUBLIC void linphone::Call::startRecording | ( |  | ) |

Starts call recording.

Video record is only available if this function is called in state StreamRunning. The output file where audio is recorded must be previously specified with CallParams::setRecordFile().

## takePreviewSnapshot()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::takePreviewSnapshot | ( | const std::string & | filePath | ) |

Take a photo of currently captured video and write it into a jpeg file.

Note that the snapshot is asynchronous, an application shall not assume that the file is created when the function returns.

Parameters

  filePath | a path where to write the jpeg content.

Returns
  0 if successful, -1 otherwise (typically if jpeg format is not supported).

## takeVideoSnapshot()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::takeVideoSnapshot | ( | const std::string & | filePath | ) |

Take a photo of currently received video and write it into a jpeg file.

Note that the snapshot is asynchronous, an application shall not assume that the file is created when the function returns.

Parameters

  filePath | a path where to write the jpeg content.

Returns
  0 if successful, -1 otherwise (typically if jpeg format is not supported).

## terminate()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::terminate | ( |  | ) |

Terminates a call.

Returns
  0 on success, -1 on failure

## terminateWithErrorInfo()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::terminateWithErrorInfo | ( | const std::shared_ptr< const linphone::ErrorInfo > & | ei | ) |

Terminates a call.

Parameters

  ei | ErrorInfo

Returns
  0 on success, -1 on failure

## transfer()

LINPHONECXX_PUBLIC LINPHONECXX_DEPRECATED linphone::Status linphone::Call::transfer | ( | const std::string & | referTo | ) |

Performs a simple call transfer to the specified destination.

The remote endpoint is expected to issue a new call to the specified destination. The current call remains active and thus can be later paused or terminated. It is possible to follow the progress of the transfer provided that transferee sends notification about it. In this case, the transfer_state_changed callback of the LinphoneCoreVTable is invoked to notify of the state of the new call at the other party. The notified states are #LinphoneCallOutgoingInit , #LinphoneCallOutgoingProgress, #LinphoneCallOutgoingRinging and #LinphoneCallConnected.

Parameters

  referTo | The destination the call is to be refered to.

Returns
  0 on success, -1 on failure

Deprecated
  27/10/2020. Use transferTo() instead.

## transferTo()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::transferTo | ( | const std::shared_ptr< linphone::Address > & | referTo | ) |

Performs a simple call transfer to the specified destination.

The remote endpoint is expected to issue a new call to the specified destination. The current call remains active and thus can be later paused or terminated. It is possible to follow the progress of the transfer provided that transferee sends notification about it. In this case, the transfer_state_changed callback of the LinphoneCoreVTable is invoked to notify of the state of the new call at the other party. The notified states are #LinphoneCallOutgoingInit , #LinphoneCallOutgoingProgress, #LinphoneCallOutgoingRinging and #LinphoneCallConnected.

Parameters

  referTo | The Address the call is to be refered to.

Returns
  0 on success, -1 on failure

## transferToAnother()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::transferToAnother | ( | const std::shared_ptr< linphone::Call > & | dest | ) |

Transfers a call to destination of another running call.

This is used for "attended transfer" scenarios. The transfered call is supposed to be in paused state, so that it is able to accept the transfer immediately. The destination call is a call previously established to introduce the transfered person. This method will send a transfer request to the transfered person. The phone of the transfered is then expected to automatically call to the destination of the transfer. The receiver of the transfer will then automatically close the call with us (the 'dest' call). It is possible to follow the progress of the transfer provided that transferee sends notification about it. In this case, the transfer_state_changed callback of the LinphoneCoreVTable is invoked to notify of the state of the new call at the other party. The notified states are #LinphoneCallOutgoingInit , #LinphoneCallOutgoingProgress, #LinphoneCallOutgoingRinging and #LinphoneCallConnected.

Parameters

  dest | A running call whose remote person will receive the transfer

Returns
  0 on success, -1 on failure

## update()

LINPHONECXX_PUBLIC linphone::Status linphone::Call::update | ( | const std::shared_ptr< const linphone::CallParams > & | params | ) |

Updates a running call according to supplied call parameters or parameters changed in the Core.

It triggers a SIP reINVITE in order to perform a new offer/answer of media capabilities. Changing the size of the transmitted video after calling linphone_core_set_preferred_video_size can be used by passing nullptr as params argument. In case no changes are requested through the CallParams argument, then this argument can be omitted and set to nullptr. WARNING: Updating a call in the #LinphoneCallPaused state will still result in a paused call even if the media directions set in the params are sendrecv. To resume a paused call, you need to call resume().

Parameters

  params | The new call parameters to use (may be nullptr).

Returns
  0 if successful, -1 otherwise.

## zoom()

LINPHONECXX_PUBLIC void linphone::Call::zoom | ( | float | zoomFactor,
|  | float | cx,
|  | float | cy )

Perform a zoom of the video displayed during a call.

The zoom ensures that all the screen is fullfilled with the video.

Parameters

  zoomFactor | a floating point number describing the zoom factor. A value 1.0 corresponds to no zoom applied.
  cx | a floating point number pointing the horizontal center of the zoom to be applied. This value should be between 0.0 and 1.0.
  cy | a floating point number pointing the vertical center of the zoom to be applied. This value should be between 0.0 and 1.0.

The documentation for this class was generated from the following file:

- call.hh