CUBE Getting "2 Valid Audio Mlines is not supported, hence disconnect the call" from an Alcatel PABX

[Fabio Funaki]

Hi,

I have an Cisco CUBE with two SIP Trunks, one for an NEC PABX and another for an Siemens PABX.

[NEC Phone] - [NEC PABX] - sip trunk - [CUBE] - sip trunk - [Alcatel PABX] - [Alcatel Phone]

When I start an call from an phone of NEC PABX I saw on the traces (debug ccsip error) "2 Valid Audio Mlines is not supported, hence disconnect the call.." from Alcatel PABX.

Is there some configuration on CUBE where I can solve this issue?

Best Regards,

Fabio

[Mohammed al Baqari]

Hi,

Try to enable sdp pass through in cube and see if this fixes the problem. Also, you can try sdp unsupported

On the dialpeer the command is voice-class sip pass sdp  (i think that was the syntax)

[Fabio Funaki]

Hi Mohammed!

The direct negotiation between the PABX didn't work before! CUBE is the solution that we believe that can be the middle element to enable this interwork.

One thing that is too strange is that I have two m lines with the same content (port, codec, dtmf):

v=0
o=OXE 1474553401 1474553401 IN IP4 10.8.102.12
s=abs
c=IN IP4 10.8.102.28
t=0 0
m=audio 32636 RTP/AVP 18 101
a=sendrecv
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=ptime:20
a=maxptime:40
a=rtpmap:101 telephone-event/8000
m=audio 32636 RTP/AVP 18 101
a=sendrecv
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=ptime:20
a=maxptime:40
a=rtpmap:101 telephone-event/8000

Best Regards

[Mohammed al Baqari]

I think this is a bug in the sender system. Not sure why they are duplicating the audio capabilities. CUBE isn't able to understand it. The only way I see it working is pass-through SDP. If this isn't working for you then I believe you need to check NEC.