Ios 为什么在GSM呼叫结束后，VoIP呼叫仍在进行时，音频会话未连接？

我从一个用户（X）呼叫另一个用户（Y）。当Y接听电话时，音频被激活

Sending signal connect set to sound devices!!

Turning cap_dev -1  play_dev -2 
app_config cap_dev -1  play_dev -1 16:17:52.265            pjsua_aud.c !Set sound device: capture=-1, playback=-1
16:17:52.265            pjsua_app.c  .Turning sound device -1 -2 ON
16:17:52.265            pjsua_aud.c  .Opening sound device (speaker + mic) PCM@16000/1/20ms
16:17:52.265        coreaudio_dev.c  ..Using VoiceProcessingIO audio unit
16:17:52.824        coreaudio_dev.c  ..core audio stream started

 after setting device status_code is 0
Turning cap_dev -1  play_dev -2 

Sending signal to disconnect from sound devices!!
16:21:25.858            pjsua_app.c !.Turning sound device -1 -2 OFF

当GSM呼叫到来时，用户X按下保持并接受选项。这一次音频被禁用

Sending signal connect set to sound devices!!

Turning cap_dev -1  play_dev -2 
app_config cap_dev -1  play_dev -1 16:17:52.265            pjsua_aud.c !Set sound device: capture=-1, playback=-1
16:17:52.265            pjsua_app.c  .Turning sound device -1 -2 ON
16:17:52.265            pjsua_aud.c  .Opening sound device (speaker + mic) PCM@16000/1/20ms
16:17:52.265        coreaudio_dev.c  ..Using VoiceProcessingIO audio unit
16:17:52.824        coreaudio_dev.c  ..core audio stream started

 after setting device status_code is 0
Turning cap_dev -1  play_dev -2 

Sending signal to disconnect from sound devices!!
16:21:25.858            pjsua_app.c !.Turning sound device -1 -2 OFF

当GSM通话结束时，音频将再次激活

pjsua_aud.c !Set sound device: capture=0, playback=0
16:45:45.131            pjsua_app.c  .Turning sound device 0 0 ON
16:45:45.131            pjsua_aud.c  .Opening sound device (speaker + mic) PCM@16000/1/20ms
16:45:45.132        coreaudio_dev.c  ..Using VoiceProcessingIO audio unit
[aurioc] 1029: failed: '!pri' (enable 3, outf< 1 ch,  44100 Hz, Int16> inf< 1 ch,  44100 Hz, Int16>)
16:45:45.394            pjsua_aud.c  .Unable to open sound device: Unknown error -560577449

pjsua_aud.c！设置声音设备：捕获=0，播放=0
16:45:45.131 pjsua_应用程序c.打开声音设备0
16:45:45.131 pjsua_aud.c.打开声音设备（扬声器+麦克风）PCM@16000/1/20ms
16:45:45.132 coreaudio_dev.c.使用语音处理IO音频单元
[aurioc]1029:失败：'！pri'（启用3，输出<1通道，44100 Hz，Int16>输入<1通道，44100 Hz，Int16>）
16:45:45.394 pjsua_aud.c.无法打开声音设备：未知错误-560577449

我尝试使用0,0和-1，-2，但出现相同的错误。gsm呼叫结束后，我无法听到任何音频。如何解决此问题。任何点击都将对我有所帮助。提前感谢