[SIPForum-discussion] Regarding sequence of 1XX response

[Niketa Pal]

Hi Nishant,

Party B can send 183 Session in Progress response before 180 Ringing. There
is no such constraint in SIP to send 180 first n then 183.

Regards,
Niketa

On Fri, May 23, 2008 at 4:03 PM, Roy, Nishant Kishore <nishantkr at hp.com>
wrote:

> Hi all,
>
> I have one call flow like ...
>
>  A               B
>  ----------INVITE-->
>  <---------183-----
>  <--some announcement will be played here ----->
>  ------PRACK------>
> <------200 ok for PRACK---
> <-----180 ringing -----
>
>
>
> Mu doubt comes over here can a party B send a 183 before 180 ..... I mean
> the 1xx response has to maintain in some sequence ?
>
>
>
>
> Regards
> Nishant
>
>
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