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

[Andrea Puddu]

I understood the concept,

but isn't the 183 mandatory to carry voice path before 200 OK?
If the 183 is not mandatory, I can't understand its utility (compared to 180).

Thanks,

Andrea



Date: Tue, 10 Jun 2008 22:51:01 -0500
From: oasanchezh at gmail.com
To: shakthi_msc at yahoo.com
CC: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Is voice path before 200 OK is valid ?

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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