Paul Mossman wrote:
> Hi all,
> 
> I'm looking into XTRN-419: MOH dialogs not terminated, where the Polycom
> fails to send BYE to sipXpark.  I am not able to reproduce this on my
> system.
> 
> One thing I notice in the attached 5dd1870e-d761efbb-7b9706bc.xml
> siptrace is that sipXpark sends three separate OPTIONS requests to the
> Polycom in the MOH dialog.  That doesn't happen in my system, and is
> probably has something to do with why my Polycom correctly sends the BYE.
> 
> I understand that this is legal for sipXpark to send the OPTIONS
> requests.  But I don't understand why it would need to do this at all,
> since the options being queried are all advertised in the INVITE.  I
> also don't understand why it sends the second and third OPTIONS
> requests, since it got an answer the first time.
> 
> Can anyone tell me why sipXpark does this, and under what conditions? 

The MOH uses the OPTIONs as a keepalive mechanism, to make sure the dialog is 
still active. What's the interval between the OPTIONs? The default I believe is 
5mins.

Arjun

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