[SIPForum-discussion] Query related to Basic SIP call

Tomasz Zieleniewski tzieleniewski at gmail.com
Wed Jan 13 21:01:21 UTC 2010


Contact Header is mandatory in INVITE request too.

Kind regards,
- Tomasz Zieleniewski
ICT Backyard - http://ictbackyard.com

2010/1/13 gaurav ahuja <gaurav.ahuja123 at gmail.com>

> Hi All,
> As per RFC 3261,
> Via, To, From, C-seq, Call-id, Max-Forwards are the only mandatory headers
> in an Invite request
> But we still add Contact Header  to know the actual address of UAC
> Suppose, in an Invite request there is no contact header,
> so when Proxy receives 180 ringing response, how it will forward that
> response to UAC  who initiated the Invite.
> Thanks in advance
> Regards
> Gaurav
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