[SIPForum-discussion] O line of SDP

[Herve Jourdain]

Hi,

 

I think that if it's the answer to the INITIAL INVITE, the "session id" and
"version" fields of the 200 OK will NOT be correlated to the ones of the
INVITE.

 

So I think that if in INVITE you have:

o=root 379 379 IN IP4 <IP1>,

 

You will have in 200 OK:

o=foo xxx yyy IN IP4 <IP2>

 

As far as I know, xxx can be different from yyy, even if the implementations
I've seen usually use the same for both (as it's recommended it should be a
NTP timestamp.).

Also, xxx and yyy would/could be different from 379 in your example.

 

Now, for modifications to the SDP in the middle of the dialog, each party
should send the offer - and response - based on the initial "session id" and
"version" fields they initially sent, with one additional rule:

If there has been ANY modification to the SDP - and if you send again, it's
probably the case - the "session id" remains the same, but the "version"
field must be incremented by 1.

 

Regards,

 

Herve

 

  _____  

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of mwilliam prusty
Sent: jeudi 10 janvier 2008 10:44
To: discussion at sipforum.org
Cc: william.prusty at gmail.com
Subject: [SIPForum-discussion] O line of SDP

 

  
Hi 

can any body tell me  suppose in the  SDP of the INVITE  contain o=root 379
379 IN IP4 <IP Address> . The SDP of 200 ok  will conatin 

o= root 379 379 IN IP4 <IP address>. Here my attention is to check  whetehr
in the O line of SDP of 200 ok will conatin 379 379 ,  or 380  380 or  it
can be anything ??  



william 

 


 
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