[Freeswitch-users] INCOMPATIBLE_DESTINATION bridging GSM to mod_skypopen

[Danny Iland]

I'm using Freeswitch as a PBX for OpenBTS, to route calls from mobile
phones to VoIP providers.

When bridging a call from a cellular handset to a mod_skypopen interface, I
get the following error as soon as the Skype call is answered. The handset
then hangs up. It appears the problem lies in the 'audio codec compare'
phase.

2013-10-16 17:54:21.932473 [DEBUG] switch_channel.c:3548 Send signal
sofia/internal/IMSI[me]@[ip] [BREAK]
2013-10-16 17:54:21.932473 [NOTICE] mod_skypopen.c:2471 Channel
[skypopen/skype101/echo123] has been answered
2013-10-16 17:54:21.932473 [DEBUG] switch_channel.c:3594
(skypopen/skype101/echo123) Callstate Change RINGING -> ACTIVE
2013-10-16 17:54:21.932473 [DEBUG] mod_skypopen.c:1232
[543dc3c|22dd4bf] [DEBUG_SKYPE  1232 ][skype101       ][UP,INPROGRS]
MSG_ID=41
2013-10-16 17:54:21.932473 [DEBUG] mod_skypopen.c:2479
[543dc3c|22dd4bf] [DEBUG_SKYPE  2479 ][skype101       ][UP,INPROGRS]
outbound_channel_answered!
2013-10-16 17:54:21.932473 [DEBUG] skypopen_protocol.c:1172
 [543dc3c|22dd4bf] [DEBUG_SKYPE  1172 ][skype101       ][UP,INPROGRS]
ACCEPTED here you send me 32776
2013-10-16 17:54:21.932473 [DEBUG] skypopen_protocol.c:1177
 [543dc3c|22dd4bf] [DEBUG_SKYPE  1177 ][skype101       ][UP,INPROGRS] 4
SO_RCVBUF is 5120, size is 4
2013-10-16 17:54:21.932473 [DEBUG] skypopen_protocol.c:1181
 [543dc3c|22dd4bf] [DEBUG_SKYPE  1181 ][skype101       ][UP,INPROGRS] 4
SO_SNDBUF is 5120, size is 4
2013-10-16 17:54:21.952511 [DEBUG] skypopen_protocol.c:207
[543dc3c|22dd4bf] [DEBUG_SKYPE  207  ][skype101       ][UP,INPROGRS]
READING: |||ALTER CALL 32 SET_INPUT PORT="32776"|||
2013-10-16 17:54:21.952511 [DEBUG] sofia_glue.c:5226 Audio Codec Compare
[GSM:3:8000:20:13200]/[PCMU:0:8000:20:64000]
2013-10-16 17:54:21.952511 [DEBUG] sofia_glue.c:5226 Audio Codec Compare
[GSM:3:8000:20:13200]/[PCMA:8:8000:20:64000]
2013-10-16 17:54:21.952511 [DEBUG] sofia_glue.c:5370 No 2833 in SDP.
 Disable 2833 dtmf and switch to INFO
2013-10-16 17:54:21.952511 [DEBUG] switch_core_session.c:858 Send signal
sofia/internal/IMSI[me]@[ip] [BREAK]
2013-10-16 17:54:21.952511 [NOTICE] switch_channel.c:3633 Hangup
sofia/internal/IMSI[me]@[ip] [CS_EXECUTE] [INCOMPATIBLE_DESTINATION]

Any advice on forcing a transcode or otherwise having the Audio Codec
Compare result in a successful bridge is appreciated.

Thanks,
Danny Iland
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