[Freeswitch-users] Simpl5[WebRTC] to PSTN codec changed during a call

Adrian Andrei koralu at gmail.com
Mon Aug 25 22:22:11 MSD 2014


In my follwing setup Sipml5 -> FS -> Cisco ->PSTN the codec is changed
during the call. At the first glance the call evolution is:

1. Sipml5 Client codec pref is OPUS,ISAC, PCMU, PCMA , Cisco voice class
codec PCMU, PCMA (g711u&a). After negociation the PCMU codec is set.

2014-08-25 19:03:05.412802 [DEBUG] switch_core_media.c:3475 Audio Codec
Compare [PCMU:0:8000:20:64000:1]/[PCMU:0:8000:20:64000:1]
2014-08-25 19:03:05.412802 [DEBUG] switch_core_media.c:3530 Audio Codec
Compare [PCMU:0:8000:20:64000:1] ++++ is saved as a match

The call is set up, voice goes well in both ways.

2. After a while(after receiving the next SDP packet from WebRtc Client) it
seems that it finds a new codec match in OPUS.

2014-08-25 19:04:11.292795 [DEBUG] switch_core_media.c:3475 Audio Codec
Compare [opus:111:48000:60:0:1]/[opus:116:48000:20:0:1]
2014-08-25 19:04:11.292795 [DEBUG] switch_core_media.c:3530 Audio Codec
Compare [opus:116:48000:20:0:1] ++++ is saved as a match

FS will change the codec and the call will end.

2014-08-25 19:04:11.292795 [DEBUG] switch_core_media.c:2260 Changing Codec
from PCMU at 20ms@8000hz to opus at 20ms@48000hz
2014-08-25 19:04:11.332798 [DEBUG] switch_core_media.c:2352 Set Codec
sofia/internal/xxxx at opus/48000 20 ms 960 samples 0 bits 1 channels
2014-08-25 19:04:11.332798 [DEBUG] switch_core_codec.c:123 sofia/internal/
xxxx at Original read codec replaced with opus:116
2014-08-25 19:04:11.352807 [NOTICE] switch_core_io.c:1257 Activating write
2014-08-25 19:04:11.752801 [NOTICE] switch_rtp.c:1144 Auto Changing
stun/rtp/dtls port from to
2014-08-25 19:04:12.072801 [ERR] mod_opus.c:402 Decoder Error: corrupted
2014-08-25 19:04:12.072801 [ERR] switch_core_io.c:1310 Codec OPUS
(STANDARD) decoder error!
2014-08-25 19:04:12.072801 [DEBUG] switch_ivr_bridge.c:579 sofia/external/
5555555 at ending bridge by request from write function

I tried to force codec on both legs by adding:
 <action application="set" data="absolute_codec_string=PCMU,PCMA"/> but
nothing change. Also inbound-late-negotiation is set to true in

Any ideea how to fix this issue?

Here is the full log: http://pastebin.freeswitch.org/23161

Thank you
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