[SIPForum-discussion] Should session version in "o=" line be same for 180 ringing and 200 ok message?

[Stephen James]

Yes that is. You cannot change the SDP answer between the 180/200 unless there is an UPDATE in between.   The change in the o= line is an indication of a change in the SDP even if there is no change in the rest of the SDP. 

Sent from my iPhone

On May 15, 2013, at 2:38, siddharth sharma <sid77sharma77 at gmail.com> wrote:

> Hi Guys,
>  
> I have one scenario, where my carrier is complaining that their calls are getting disconnected after few milliseconds.
> According to their analysis, they are saying that session version in "o=" line  is not same as in 180 ringing and 200 Ok message.
> Because of this, they are sending BYE message.
>  
> Is this valid reason?
>  
> I have checked message, I have not found any difference.
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