[cisco-voip] fast busy when phone CFA via CUBE

[Jason Aarons (AM)]

Ah no.  Capabilities mismatch requires either MTP/Transcoder.

You should be able to see in Wireshark your SDP being sent and what codecs to confirm.  AVP 0 is G711 and AVP 18 is G729.  http://en.wikipedia.org/wiki/RTP_Audio_Video_Profiles


From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick Wellnitz
Sent: Thursday, August 01, 2013 10:35 AM
To: cisco-voip
Subject: [cisco-voip] fast busy when phone CFA via CUBE


I have an issue which is probably very easy to fix but I think I'm making it more complex than I need to.

I have a Nortel that we are migrating to CUCM 9.1 from.  In the interim, we have interated the two using SIP via CUBE.  PSTN gateway is H323.  I wouldn't normally do this but decisions get made and we have to deal with it.

Call from Nortel to IP Phone works fine.  Call forward that same IP Phone to a PSTN number and the call connects to the external number as if nothing was wrong but the Nortel phone gets dropped with a 'fast busy'.

Traces and TAC (626731957) that my colleague opened seem to show a codec /capabilities mismatch but I can't find a codec mismatch in the system at all and our reporting/monitoring tool shows the call trying to connect as G711u on both sides.

Is this a situation where an MTP is gong to be necessary or is there a way to avoid mandatory MTP?

Thanks in advance!


itevomcid
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