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

[Sandeep Mohapatra]

Hello All,

Yes before 200Ok voice path can be established and it can be bidirectional. As perr SIP terminology we call it as Early media session. However, this is not a permanent session. This early media session converted in to a permanent session once the ACK is sent out from the source nad received by destination.

you can google the string "Early media session" for details.

Regards,
Sandeep
Keane India

--- On Mon, 9/6/08, sreekant nair <sreekant_nair at yahoo.com> wrote:
From: sreekant nair <sreekant_nair at yahoo.com>
Subject: Re: [SIPForum-discussion] Is voice path before 200 OK is valid ?
To: "ganesh gouda" <gkgouda at gmail.com>, "Sharanagoud BD." <sharanagoud_bd at spanservices.com>
Cc: "SIP" <discussion at sipforum.org>
Date: Monday, 9 June, 2008, 8:49 PM

If my understanding is correct, the arrow showing the RTP (before 200OK) cannot be a BI-DIRECTIONAL arrow and should be an arrow from B ---> A. I have seen this happen. for e.g.The ring back tone from the terminator of the call can be sent as RTP media  stream that is generated at the UA end itself. Some time the proxy at UA-A may play the tone, else, it can act as a pass through and choose to play whatever media comes from the terminator of the call. 

Thanks
Sreekant

----- Original Message ----
From: ganesh gouda <gkgouda at gmail.com>
To: Sharanagoud BD. <sharanagoud_bd at spanservices.com>
Cc: SIP
 <discussion at sipforum.org>
Sent: Monday, June 9, 2008 9:30:03 AM
Subject: Re: [SIPForum-discussion] Is voice path before 200 OK is valid ?


Hi sharngoud, 
would u like to tell me how it is valid scenario with out final responce coming from  UA.
I am sorry i am new to SIP,i want to know more regarding the same.

 
On 6/9/08, Sharanagoud BD. <sharanagoud_bd at spanservices.com> wrote:


This is valid scenario
 
Thanks,
Sharanagoud.
   

 



From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Shakthi

Sent: Monday, June 09, 2008 12:32 PM
To: SIP
Subject: [SIPForum-discussion] Is voice path before 200 OK is valid ?

 






 
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
 

_______________________________________________
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






      _______________________________________________
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


      Check out the all-new face of Yahoo! India. Go to http://in.yahoo.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20080610/c2e7b973/attachment-0002.html>