2 apr 2007 kl. 10.46 skrev 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.txt I 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.
As always, there are many ways to handle this. If your phone supports
SUBSCRIBE, Asterisk does it too.
In that case, it's up to the phone.
Otherwise, you could come up with a multiprotocol dialplan-based
solution where you
- answer A's call and play a prompt for "busy" or "no reply" - like
in Voicemail
- ask the user to press 1 to redial (if B is busy)
- have an app monitor B's connection over manager
- when B is done, place call to A, then connect to B
- lock B so no one else calls in between
The big issue here is the external app. Maybe someone can figure out
a way to do it without it...
/Olle
---
* Olle E. Johansson - [EMAIL PROTECTED]
* Asterisk Training http://edvina.net/training/
* Asterisk SIP master class, Stockholm may 2007 - register now!
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