[asterisk-users] SIP - Automatic Redial on No Answer

[Olivier]

Hi,

What is the best way to implement Automatic Redial on No Answer ?

Looking at
http://www.ietf.org/internet-drafts/draft-ietf-sipping-service-examples-12.txtI
can see how Automatic Redial on Busy could (should) be done.
How would you do it on No Answer ?

Is there any event you should SUBSCRIBE to so that you're notified that
you're callee is available ?
What if you ask to be notified of next call ending ?

This is particularly useful when phones accept several calls : on some of
them, I couldn't find a way to force them to reply "486 BUSY" after a wait,
when the callee is on call and couldn't explicitly reject or accept the
incoming call.

The scenario is :

A calls B which is already on call,
B is notified another call is here but B don't either reject or answer the
incoming call
A has no way to know if the call is not answered because B is not there or
too busy to reply
Ideally, A would then ask for Automatic Redial on No Answer, with a
NOTIFY-SUBSCRIBE
Later, when B is finishing a call (the one he was busy with or a brand new
one after returning to his desk), A is notified and Automatic Redial can
occur.

Regards
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