Hi Sharan
If the incoming INVITE contains 100rel option tag in Require header, the UAS
should send 18x reliably irrespective of the tag being included or not in
Supported header.
Please see the following sections in RFC 3262.
Sec 3 UAS Behavior:
A UAS MAY send any non-100 provisional response to INVITE reliably,
so long as the initial INVITE request (the request whose provisional
response is being sent reliably) contained a Supported header field
with the option tag 100rel.
The UAS MUST send any non-100 provisional response reliably if the
initial request contained a Require header field with the option tag
100rel. If the UAS is unwilling to do so, it MUST reject the initial
request with a 420 (Bad Extension) and include an Unsupported header
field containing the option tag 100rel.
If the request did not include either a Supported or Require header
field indicating this feature, the UAS MUST NOT send the provisional
response reliably.
8.1 IANA Registration of the 100rel Option Tag
This specification registers a single option tag, 100rel. The
required information for this registration, as specified in RFC 3261,
is:
Name: 100rel
Description: This option tag is for reliability of provisional
responses. When present in a Supported header, it indicates
that the UA can send or receive reliable provisional responses.
When present in a Require header in a request, it indicates
that the UAS MUST send all provisional responses reliably.
When present in a Require header in a reliable provisional
response, it indicates that the response is to be sent
reliably.
Regards
Rohit Aggarwal
Aricent
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Sharanabasavaraj Mathapati
Sent: Friday, December 18, 2009 11:17 AM
To: [email protected]
Subject: [Sip-implementors] Reg: Reliable provisional response
Hi All,
RFC says it is MUST to send Reliable provisional response when the "100rel" is
present in "Required" header. But is it MUST to have "Supported" header also
with "100rel"?
What if an INVITE has only "Required" header with "100rel" option and doesn't
have "Supported" header with "100rel"?
Regards,
Sharan
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