[SIPForum-discussion] SIP trunking & contact field

[Hadriel Kaplan]

Trunk groups are defined by RFC 4904.  A "tgrp" param is one from that RFC, but as a URI user-parameter for SIP-URI's, not a URI parameter; and both the tgrp and trunk-context user parameters have to be there.  In the contact it's the originating trunk group.  But your device should just ignore that tgrp param type as something different, and act as if no trunk-group param was received, for the purpose of trunk group routing.  However, it's true that 3261 does not allow a quoted-string for a uri-param, so that could be your problem.

-hadriel

________________________________
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Raghul Prasanna
Sent: Saturday, July 19, 2008 7:28 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] SIP trunking & contact field


Hi All,



  Calls being presented from Nextone carrier are rejected. When I looked at the packet trace I saw, the contact field as



sip:123456 at xxx.xxx.xxx.xxx:5060;tgrp="LVL41I">.. I suspect its because of the "" because I cannot find in RFC 3261 anything abt "".



  Also looks like its using SIP trunking. Does tgrp mean trunk group and is it an identifier of a trunk group.



  So can anyone explain is my guess right? and also can anyone give me more details on SIP trunking please?



Thanks,

Raghul




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