[SIPForum-discussion] Query related to Basic SIP call

[gaurav ahuja]

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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