[SIPForum-discussion] PRACK when using TCP

[Hemant Kumar]

Hi,

TCP as a transport layer protocol just ensures that the transmitted packets
are received by the destination while PRACK messages are acknowledgement
for SIP(Application layer protocol) reliable provisional responses.
So a PRACK message received by a UAC ensures not only that the reliable
response has been received by UAS's transport layer but also that it has
been processed by its SIP layer.

Also think of a scenario in which media negotitations happen in 1xx-PRACK
message exchange.

Regards,
Hemant


On Tue, Nov 1, 2011 at 11:43 PM, Keyur Amin <fossil0681 at yahoo.com> wrote:

>  Hello All,
>
> Is there any reason why one should use PRACK when using TCP as the
> transport? In my opinion, it does not make any sense to use PRACKs when
> using TCP. RFC3262 does not clearly mention about usage of reliable
> transport or TCP when using PRACKs.
>
>  *Thanks,*
> *Keyur Amin*
>  ------------------------------
>
>
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