[SIPForum-discussion] Is voice path before 200 OK is valid ?

[Oscar Alonso Sánchez Hernández]

Hello
Scenaries that involve RTP flow before 200 OK responses to an INVITE has
several goals: puts announcements, per example for prepaid services, color
ring back tone services. SDP carried in the provisional response (i. e. 180,
183) conveys the IP address of the media server that supplies the
announcement. The 200 OK response to INVITE carries SDP with IP address of
final destination.



2008/6/9 Shakthi <shakthi_msc at yahoo.com>:

>
>
> Is voice path before 200 OK is valid ?
>
>
>
> Pls look at the call flow:
>
>
>
>     A                                B
>
>
>
>               INVITE
>
>      --------------------------------->
>
>             180 Ringing
>
>     <---------------------------------
>
>            RTP (g.723)
>
>     <-------------------------------->
>
>             200 OK
>
>      <-------------------------------
>
>             RTP (g.723)
>
>      <------------------------------>
>
>             ACK
>
>       ------------------------------->
>
>             BYE
>
>       <-----------------------------
>
>             200 OK
>
>        ------------------------------->
>
>
>
> Is this a valid call flow?
>
> Can RTP come in to the scene before 200 OK?
>
>
>
> - Thanx
>
>
>
>
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-- 
Oscar Alonso Sánchez Hernández
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