Yes; it is possible.  It can occur anytime a device wants to do it.  Some 
B2BUAs will do it (change both ip-address and port) when reconnecting A from B 
to C using the same dialog between A and B2BUA.

> -----Original Message-----
> From: ikuzar RABE [mailto:[email protected]]
> Sent: Tuesday, June 18, 2013 8:01 AM
> To: [email protected]
> Subject: Re: [Sip-implementors] ports renegociation
> 
> Nobody has an idea ... ??
> 
> 
> 2013/6/11 ikuzar RABE <[email protected]>
> 
> > Hi all,
> >
> > I 'd like to know if  ports can be renegotiated (with a new INVITE
> for
> > example) while RTP flows are already established ... !
> > If it is possible, in which case we can face with this situation ?
> > (multicast ? other ?)
> >
> > Thanks for your help
> >
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