[cisco-voip] Problems with Conference, Transfer, and Hold between Nortel QSig, h.323, and UCM

[Chris Ward (chrward)]

I would also go with MTP. However, I would make sure that you are actually allocating and MTP with the call when you check the box. You need to have an MTP capable of the codec that is configured in your region setup in the MRGL of the GW where the call is coming in from Nortel (3945?). Also, while the call is up, you could check the RTP statistics of the call and see where the phone is sending RTP to and verify it is going to the IP address of the MTP.

+Chris
Unity Connection TME

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Dowdy
Sent: Sunday, January 27, 2013 9:45 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Problems with Conference, Transfer, and Hold between Nortel QSig, h.323, and UCM

Here's the situation:

Nortel PBX (QSig)  -> Cisco 2921 (H.323) -> Cisco 3945 (H.323) -> UCM 8.5.1

Calls coming from the Nortel to the UCM complete fine, but Hold, Transfer and Conference do not work.  The call hears silence for a few seconds - up to 30 sec - and then the call disconnects.  Calls only initiate in the above direction.  Not sending calls directly to UCM because some calls go out PRIs on the 3945 (maybe I can put dial peers on the 2921, pointed to the subscriber, specifically for UCM?).  Tried checking the Requires MTP box on the UCM Gateway config.  A colleague suggested:



voice service voip
supplementary-service h450.2
supplementary-service h450.3


Hadn't tried this yet because I did not want to affect calls as this site it always critical and in use - never any real down time.  Just looking for suggestions.  Anyone have some?

Ryan
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