Yes, You 'SiM' to be right !
SiM <[EMAIL PROTECTED]> wrote:
Hi Ram,If the 1xx establishes an Early dialog, the Contact has to be there as it will be a part of the Dialog construction mechanism at the UAC, and will be used in mid-dialog request if any for constructing any Request before the INVITE transaction completes.From RFC 3261 (Page 71, Sec 12.1.2 UAC Behaviour ):The remote target MUST be set to the URI
from the Contact header field of the response.If the 18x does not establish a dialog (i.e, to tag does not exist ), i dont think Contact is required, please correct me if i'am wrong !The below discussion is supposedly for Dialog establishment with 18x, therefore a Contact is mandatory.Sec 12.1.1 says that Contact is a must for responses that establishes a Dialog (also an Early Dialog, as in this case).Thank you.Cheers.Simith
Ramachandran Iyer <[EMAIL PROTECTED]> wrote:Yes,you are right that 3261 does mention a MUST, for a contact to be present in 18x.But i am still thinking, why would you want to mandate (MUST) the UAS for having a contact, may be it does not have any different contact to give at all. It may be pretty happy to be contacted at the same To: Uri present in the INV.. I do not believe or see a reason for mandating a contact here. It will be nice to hear from some1 if there is a reason to it.Rama
KrishnaKanthT 70508 <[EMAIL PROTECTED]> wrote:Hi,
It is mandatory for the 18x to have contact header when it has 100Rel.
According to rfc3262, a provisional response that is to be sent reliably MUST establish a dialog. According to section 12.1.1 of rfc3261, any response that establishes a dialog must contain a CONTACT header field.
Rgds
Krishna
>
> Message: 5
> Date: Tue, 22 Jun 2004 13:47:50 +0530
> From: <[EMAIL PROTECTED]>
> Subject: RE: [Sip-implementors] Question on 18x and PRACK
> To: <[EMAIL PROTECTED]>
> Cc: [EMAIL PROTECTED]
> Message-ID:
> <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Kasam,
>
> No it is not mandatory to have the contact header in 18X when it
> requires 100rel.
&a! mp;g! t;
> Yes it is MUST to retransmit a PRACK until you get a response for
> PRACK.
> Prack should be handled as any non-invite request.
>
>
> HTH,
>
> Regards,
> SReeram
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> KasammiyaPatil
> Sent: Tuesday, June 22, 2004 2:13 AM
> To: [EMAIL PROTECTED]
> Subject: [Sip-implementors] Question on 18x and PRACK
>
>
> Hi all,
>
> Is it a MUST for 18x message to have Contact header if it
> requires 100rel ?
>
> Is it a MUST to retransmit a PRACK ?
>
> Kasam Patil
> CS2K SIP Design and Development
> ESN: 351 8346 External: 919 991 8346
> Yahoo ID: kasampatil
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