[SIPForum-discussion] Reliable provisional response

HM Kias hmkias at gmail.com
Thu Jul 7 03:48:44 UTC 2011

One of the scenario is when  a proxy receives an invite from client A and
forks to multiple Clients  eg. B & C. In this case the client B & C begins
alerting client A by sending 2 provisional responses.

The 2 provisional responses are identical except for having different TO
tags & contact URIs.

The PRACK method is used to acknowlegde receipt of reliably transported
provisional responses. The UAC generates the PRACK when a provisional
response is received containing Rseq & 100Rel headers.

On Mon, Jul 4, 2011 at 10:37 PM, K Satyadarshi <satyadarshi28 at gmail.com>wrote:

>  Hi Forum,
> Can someone pls tell about scenarios where a proxy can send reliable
> provisional responses ?
> --
>  K Satyadarshi
>  <satyadarshi28 at gmail.com>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org

HM Kias
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20110707/93f49748/attachment-0002.html>

More information about the discussion mailing list