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

[sid]

Thank you, 
this has clarified that change in version is the issue. 
Can you help me in identifying the cause behind this?

Sent from my iPod

On 15-May-2013, at 9:50 PM, Stephen James <sjames_1958 at yahoo.com> wrote:

> 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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