我最近在我的iOS App中添加了pjsip VoIP功能。在应用程序处于活动状态时使用pjsip提供没有问题，我可以无问题地接收和拨打电话。
但我似乎在后台有声音设备的问题。我从后台收到的第一个电话工作正常，我收到声音，我可以正常关闭它。
问题出在第一次通话后，当我接受来自后台的电话时，我听不到任何声音。如果我在应用程序处于活动状态时拨打或接听电话，然后转到后台接听电话，也会发生同样的情况。当我关闭应用程序时，后台的第一个呼叫会再次正常工作。
我不知道是什么原因引起的。
我试图通过CallManager手动关闭所有调用，当服务器端终止调用时我调用CXEndCallAction，以使CallKit正常关闭。
我很乐意发布特定的代码段落，但目前，我不知道问题可能在哪里......
更新：
我已经发现pjsip coreaudio第二次初始化不同。
现在问题是，我如何正确地重置pjsip中的CoreAudio？
成功呼叫初始化：
11:03:01.615 tsx0x1030710a8 .....State changed from Trying to
Proceeding, event=TX_MSG
11:03:01.615 dlg0x1030840a8 ......Transaction tsx0x1030710a8 state changed to Proceeding
2019-02-13 11:03:01.615745+0100 VarioCallCTI[11928:2820452] Incoming call from "Matthias" <sip:[email protected]>
11:03:01.618 pjsua_aud.c ..Set sound device: capture=0, playback=0
11:03:01.618 pjsua_aud.c !Set sound device: capture=0, playback=0
11:03:01.619 pjsua_aud.c !...Opening sound device PCM@16000/1/20ms
11:03:01.619 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.808024+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 16000 Hz, Int16> inf< 1 ch, 16000 Hz, Int16>)
11:03:01.851 pjsua_aud.c ...Opening sound device PCM@44100/1/20ms
11:03:01.851 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.859854+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 44100 Hz, Int16> inf< 1 ch, 44100 Hz, Int16>)
11:03:01.860 pjsua_aud.c ...Opening sound device PCM@48000/1/20ms
11:03:01.860 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.867061+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 48000 Hz, Int16> inf< 1 ch, 48000 Hz, Int16>)
11:03:01.867 pjsua_aud.c ...Opening sound device PCM@32000/1/20ms
11:03:01.867 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.874321+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 32000 Hz, Int16> inf< 1 ch, 32000 Hz, Int16>)
11:03:01.875 pjsua_aud.c ...Opening sound device PCM@16000/1/20ms
11:03:01.875 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.881126+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 16000 Hz, Int16> inf< 1 ch, 16000 Hz, Int16>)
11:03:01.881 pjsua_aud.c ...Opening sound device PCM@8000/1/20ms
11:03:01.881 coreaudio_dev. ....Using VoiceProcessingIO audio unit
2019-02-13 11:03:01.888214+0100 VarioCallCTI[11928:2820452] [aurioc] 1029: failed: '!int' (enable 3, outf< 1 ch, 8000 Hz, Int16> inf< 1 ch, 8000 Hz, Int16>)
11:03:01.888 pjsua_aud.c ...Unable to open sound device: Unknown error -560117684 [status=-560117684]
Error in Setting of Audio Devices - IncomingCall
TESTPRINT FOR NOTIFICATION INFO: eingehender anruf von 238
TESTPRINT FOR NOTIFICATION INFO: 238
不成功的呼叫初始化：
11:03:49.840 tsx0x103064ea8 .....State changed from Trying to Proceeding, event=TX_MSG
11:03:49.840 dlg0x1030906a8 ......Transaction tsx0x103064ea8 state changed to Proceeding
2019-02-13 11:03:49.841013+0100 VarioCallCTI[11928:2820906] Incoming call from "Matthias" <sip:[email protected]>
11:03:49.842 pjsua_aud.c ..Set sound device: capture=0, playback=0
11:03:49.842 pjsua_aud.c ...Opening sound device PCM@16000/1/20ms
11:03:49.842 coreaudio_dev. ....Using VoiceProcessingIO audio unit
11:03:49.847 pjsua_aud.c !Set sound device: capture=0, playback=0
2019-02-13 11:03:50.276837+0100 VarioCallCTI[11928:2820280] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port Speaker (type: Speaker)
2019-02-13 11:03:50.277597+0100 VarioCallCTI[11928:2820280] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port Receiver (type: Receiver)
2019-02-13 11:03:50.292488+0100 VarioCallCTI[11928:2820280] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port Receiver (type: Receiver)
2019-02-13 11:03:50.293379+0100 VarioCallCTI[11928:2820280] [avas] AVAudioSessionPortImpl.mm:56:ValidateRequiredFields: Unknown selected data source for Port Receiver (type: Receiver)
11:03:50.383 coreaudio_dev. !....core audio stream started
Setting of Audio Devices Successfull - IncomingCall
TESTPRINT FOR NOTIFICATION INFO: eingehender anruf von 238
TESTPRINT FOR NOTIFICATION INFO: 238
我已经想出如何解决这个问题。
由于PJSIP库Init导致coreAudio在iOS完全完成优先级之前初始化，我不得不打开CallKit并在CallKit内的PJSIP服务器上注册 - ProviderDelegate
func reportIncomingCall(uuid: UUID, handle: String, hasVideo: Bool = false, completion: ((NSError?) -> Void)?) {
let update = CXCallUpdate()
update.remoteHandle = CXHandle(type: .generic, value: handle)
update.hasVideo = hasVideo
//MARK: Final Working Solution
print("Starting PJSIP after PUSH")
pjsipfunctions.init().registersip(mainUser.sipData["User"], mainUser.sipData["Password"], mainUser.sipData["Server"])
provider.reportNewIncomingCall(with: uuid, update: update) { error in
if error == nil {
let call = Call(uuid: uuid, handle: handle)
self.callManager.add(call: call)
userTerminatedCall = false
}
completion?(error as? NSError)
}
}
}