It currently is not possible.  However it sounds like a wonderful way to annoy 
the neighbors by causing the phone to ring for a long time.

> -----Original Message-----
> From: Sithara Santharam [mailto:[email protected]]
> Sent: Friday, April 26, 2013 6:56 AM
> To: [email protected]
> Subject: [Sip-implementors] Extend call ringing
> 
> Hi,
> Please assume the scenario where A calls B. B keeps ringing without
> answering. B is pre-configured to ring for 20 seconds before dropping
> an
> unanswered call. So after 20 seconds B drops call.
> 
> I would like to know if there is a way in which the caller A can extend
> the
> call by sending re-invite so that B keeps ringing for another period.
> If
> so, is there a particular format/parameters for the re-invite?
> 
> [This scenario becomes more meaningful in case when there is an
> Auto-attendant in between, but let us assume direct call from A to B
> for
> now.]
> 
> Please let me know if this is possible.
> 
> Thanks
> Sithara
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