[SIPForum-discussion] SIP trunking & contact field

[Raghul Prasanna]

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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