No codec matched

```
When I was doing imsdroid, I encountered a problem. Can I make a phone call,
but can't pick up the phone.
When I call the acceptCall method, will error:
---------------------------------------------------------
error opening trace file: No such file or directory (2)
***ERROR: function: "tdav_session_audio_start()"
file: "src/audio/tdav_session_audio.c"
line: "389"
MSG: No codec matched
***ERROR: function: "tmedia_session_mgr_start()"
file: "src/tmedia_session.c"
line: "873"
MSG: Failed to start audio session
***ERROR: function: "tdav_session_video_start()"
file: "src/video/tdav_session_video.c"
line: "1030"
-------------------------------------------------
Anyone can help me, I will be very grateful.This problem has been bothering me
for a long time.
```

Original issue reported on code.google.com by `mzz5...@gmail.com` on 27 Dec 2013 at 3:36