[cisco-voip] Inbound SIP Calls routing over QSIG link

[Bob Zanett (US)]

Going between SIP and MGCP - you will most likely require an MTP resource.  A transcoder will perform that but you may not require a full transcode resource.

DTMF:   Usually DTMF has to be converted from RFC2833 (typically used) to MGCP.  There is a command you can place on the MGCP gateway to allow it to understand RFC 2833 DTMF - search on Cisco for MGCP and RFC2833.  However, you would need to validate that all potential endpoints within your Cisco environment can also handle it - otherwise MTP again.

Codec: I would assume your codec is remaining the same either G711 or G729.  If codec changes, then yes you would require a transcode resource.

Bob

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of ROZA, Ariel
Sent: Tuesday, February 15, 2011 3:19 PM
To: Nick; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Inbound SIP Calls routing over QSIG link

Nick,

A Resources Unavailable message sounds like you need to enable the use of transcoding for the call.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Nick
Sent: martes, 15 de febrero de 2011 01:24 p.m.
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Inbound SIP Calls routing over QSIG link

Hi All

I'm trying to route inbound calls from SIP trunks through CUCM to another PBX connected with QSIG, I have CUCM 8.0.3, with QSIG links to a IPC dealerboard system and also a Nortel CS1000 PBX, these are set up as MGCP in CUCM.

I also have SIP trunks for PSTN providing both inbound and outbound calling. The issue I have is when I route inbound calls from the SIP trunks to CUCM and across the QSIG links to the PBX's, the call will not complete and I get Resources Unavailable, Unspecified on the debug on the gateway, I have also taken a SIP trace and get a 503 Service Unavailable from CUCM to the SIP trunks for the same call.

Has anyone successfully done this before and can I route SIP to Qsig or would I need a CUBE even though its going through CUCM.

I have attached the debug and SIP trace.

Any help would be greatly appreciated as this is rather urgent now.

Regards

Nick


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