Hello All,
I'm facing an unique issue with a specific SIP Server in here.
The issue is - the' Contact' header is always missing in the 200-OK
message sent in reply to the initial REGISTER message. However when I try with
X-Lite with this Server, it works properly even if the contact header is
missing
in the 200-OK.
As per my understanding of RFC3261 Section 10.3, it
is mandatory for the Server to send a contact info in the 200-OK response to
the
REGISTER request. But what I'm failing to understand is what happens if there
is
no contact header present in the 200-OK message? How is a SIP UA expected to
behave in such scenario? Is there any mandate to address such a scenario - or
is it left onto the SIP client vendor to implement there own customisation?
Awaiting your valuable response.
Thanks,
Ansuman
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