[SIPForum-discussion] SIP reliable response ..

[Garron, James]

Per RFC3262 section 3:

 

:

The provisional response to be sent reliably is constructed by the UAS
core according to the procedures of Section 8.2.6 of RFC 3261
<file:///C:\Misc\Protocols\SIP\rfc3261.html#sec-8.2.6> . In addition, it
MUST contain a Require header field containing the option tag 100rel,
and MUST include an RSeq header field. The value of the header field for
the first reliable provisional response in a transaction MUST be between
1 and 2**31 - 1. It is RECOMMENDED that it be chosen uniformly in this
range. The RSeq numbering space is within a single transaction. This
means that provisional responses for different requests MAY use the same
values for the RSeq number.

:

 

SIP/2.0 183 Progress

[last_Via:]

[last_From:]

[last_To:];tag=[call_number]

[last_Call-ID:]

[last_CSeq:]

Contact: <sip:[local_ip]:[local_port];tranport=UDP>

Content-Type: application/sdp

Content-Length: [len]

Require: 100rel

RSeq: 1

Allow: INVITE, BYE, OPTIONS, CANCEL, ACK, REGISTER, NOTIFY, INFO, REFER,
SUBSCRIBE, PRACK, UPDATE

 

v=0

o=user1 1 2 IN IP4 [local_ip]

s=-

c=IN IP4 [local_ip]

t=0 0

m=audio 10000 RTP/AVP 18 8 0 100

a=rtpmap:18 G729/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:100 telephone-event/8000

a=fmtp:100 0-15

a=sendrecv

 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Murali Vuppandla
Sent: Monday, April 26, 2010 3:10 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] SIP reliable response ..

 

When there is a Required/Supported header contains 100rel tag  in INVITE
then UAS will send a reliable response, after which it has to be
acknowledged with PRACK. But when it comes to the actual content of the
message, what makes Reliable responses different from normal SIP
provisional responses. 

 

Means to say what other extra information does it carry ???  Please
clarify me.

 

Regards,

Murali.

 

 

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