[SIPForum-discussion] sip prack

[AMIT ANAND]

On Thu, Dec 30, 2010 at 8:58 PM, karthik <karthik8989 at rediffmail.com> wrote:

> Hi ALL,
>
> Please help me understand this....
>
> 1.What is prack?
>
  Prack is ACK for provisional responses.

>
> 2.why is prack used?
>
  To acknowledge provisional responses , 1XX series

>
> 3.What are the reasons for using prack?
>

To ensure provisional response is delivered

>
> 4.What is the difference between prack , ack and 200 OK?
> Prack can only be used to ack provisional responses, 200OK is a final
> response, ACK is used to acknowledge 200OK.
>
For more details refer RFC 3262 and RFC3261.



> Thanks,
> Karthik
>
>
>
>
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-- 
Thanks
Amit Anand
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