[Asterisk-Users] automatic callback when busy

[Tamás Bondár]

I'm trying to set up the following application:

When a SIP extensions calls another one which is busy, the caller would be 
able to ask for an automatic callback: when the callee becomes available 
again, asterisk would ring both the caller's and the callee's phones and 
connect them when both parties answer.

Has anybody done this before? (I tried to search the archs but couldn't find 
this yet.) Any suggestions for the best solution?

Thanks a lot in advance!

Regards,
-Tamás