[cisco-voip] CUCM 6.1 and SIP Trunking

[Nicholas Samios]

The software MTP on UCM only supports 711, if you need to use 729 you'll need to configure an external MTP/transcoder or CUBE.

Using a CUBE in the middle as a demarc is best practice, gives you all the features of SIP & SDP manipulation (e.g delayed to early, message normalization), transcoding, etc and also avoids a direct SIP trunk to your UCM.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Cristobal Priego
Sent: Tuesday, July 26, 2011 1:28 AM
To: David Martin
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CUCM 6.1 and SIP Trunking

on version 6.X if you want to send a early offer on your sip trunk you need MTP and the codec supported is g.711 only. if you're trying to use g.729 is not going to work
2011/7/25 David Martin <adavidm at gmail.com<mailto:adavidm at gmail.com>>
All,

I am trying to set up a SIP trunk between CUCM 6.1 and Freeswitch. I only need calls outbound from Cisco to Freeswitch at the moment but am having some difficulties.

The Cisco side never sends an SDP, either in the INVITE or the ACK, and Freeswitch needs this to operate. I have tried using "require media termination point" and "disable early media" options but there appears to be no difference, which is strange. I include a pastebin of the conversation:

http://pastebin.com/T3eqms8N

and a couple of screenshots of the CUCM config for the trunk.

http://img200.imageshack.us/img200/9405/siptrunk.png

http://img191.imageshack.us/img191/3863/sipprofile.png

Any thoughts on where to start looking? I was wondering if CUCM will continue to attempt the call if there is a problem with the MTP( I am using software MTP on CUCM at the moment). If this is the case then I can see why the SDP does not appear in the INVITE (assuming the MTP is broken), but not why it does not appear in the ACK.

Thanks in advance.

David

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