[SIPForum-discussion] User portion of Contact header in 200 OK for REGISTER

[Santosh Iyer]

Need your input on how the Contact header in a 200 OK of a REGISTER message should look like. The device in question sends a REGISTER message Whose contact header looks like

Contact: <sip:9876543210 at 192.168.0.1:5060>;expires=3600

The Contact header in the 200 OK for the REGISTER message looked like below
Contact: <sip:9876543210;tgrp=1111;trunk-context=33333 at 192.168.0.1:5060>;expires=3600
Trying to find out if the contact header in the 200 OK falls within the realms of any RFC, I know that syntax wise it is fine, but from a logical standpoint is it OK to add more parameters in the 200 OK contact header and return it back. The device in question thinks that the user portion of the contact in the 200 OK doesn't match the user portion of the contact header in the REGISTER message and behaves as if the registration attempt failed and keeps on retying.
Would Appreciate if you could point me to the right section in the RFC as to whether the behavior is correct or otherwise.
Thanks,Santosh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20130212/cb873ad6/attachment-0002.html>