[SIPForum-discussion] 183 response code

[Abhisek Acharya]

Yes PRACK can contain sdp bodies as well.This is a implementation dependent
scenario.At times if  18x response contains a offer then answer must be
given by PRACK.


On Wed, Oct 10, 2012 at 9:20 PM, siddharth sharma
<sid77sharma77 at gmail.com>wrote:

> Excellent explanation abhishek. Thnx for this.
> I would like to have one query. Does PRACK can contain SDP information? if
> yes, then what are those cases?
>
> On Tue, Oct 9, 2012 at 4:41 PM, Abhisek Acharya <abhisek.acharya at gmail.com
> > wrote:
>
>> 183 or 18x response will only be ACKED if they are travelling
>> Reliably.That perticular mechanism is called PRACK where for every 18x
>> response ther will be a corresponding PRACK message will go.!8x response
>> will contain a Rseq header and PRACK will contain a Rack header.Rseq
>> contains a numerical value and Rack just copies that value and sends it to
>> the other end. PRACK is a different request so it also gets the 200
>> response.
>>
>> Corresponding 18x responses MUST keep increasing the Rseq value by a
>> numerical value 1 and alos corresponding PRACK messages
>> keep acknowledging the new Rseq value with Rack value.
>>
>> At the end both the parties MUST support this mechanism and this is
>> mentioned in RFC 3262.INVITE must contain supported:100rel and 18x response
>> MUST and MUST contain Require:100rel tag to kick in the PRACK
>> mechanism.Please read RFC 3262 for any clarifications in this.Also If
>> possible send a call trace for any doubt.
>>
>>
>> Regards
>> Abhisek Acharya
>> PUNe
>>
>>
>> On Mon, Oct 1, 2012 at 10:33 AM, sunil singh <sunilsingh_test at yahoo.in>wrote:
>>
>>>  There are two things.
>>>
>>> 1. Generation of 183 message.
>>>
>>> if INVITE doesnot have SUPPORT header for option-tag 100REL, 183 can not
>>> be generate. Response of the 183 message is based on the Require header
>>> with option-tag 100rel in the 183.
>>>
>>> 2. Generation of 183 with SDP.(there is not mandetory condition that 183
>>> should have sdp ALWAYS)
>>>
>>> 183 message send SDP is must if INVITE does not has SDP.  in this
>>> condition PRACK should have SDP.
>>>
>>> Thanks,
>>> Sunil
>>>
>>>   ------------------------------
>>> *From:* AMIT ANAND <amiit.anand at gmail.com>
>>> *To:* Jing Jiang <jjiang at biamp.com>
>>> *Cc:* "discussion at sipforum.org" <discussion at sipforum.org>
>>> *Sent:* Saturday, 4 December 2010 6:30 PM
>>> *Subject:* Re: [SIPForum-discussion] 183 response code
>>>
>>>
>>> No need to respond until it has require:100 REL, in case it has require
>>> : 100REL then you need to send PRACK for it..
>>>
>>>
>>>
>>> On Sat, Dec 4, 2010 at 1:22 AM, Jing Jiang <jjiang at biamp.com> wrote:
>>>
>>>  When 183 response message  with SDP is received, should the client ack
>>> this message?
>>>
>>>  *Jing Jiang *
>>>
>>>
>>>
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>>>
>>> --
>>> Thanks
>>> Amit Anand
>>>
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>>
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>
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