we need to be installed on a Linux Box:
A calls B over C, X is the phonenumber of B
A dials number X over C, C plays welcome message and connects to B after; this welcome message has a duration of Y seconds.
This message we would like to overlay with "our own" welcome message; .wav or mp3 or whatever you suggest.
You can solve it when you put A to a extension that plays music, while B is already connected and giving its message...then after Y secondss A and B get bridged.
If you can also implement a RBT detection that detects RBT and cuts the music and bridges A and B, this would be the best !
Billing of the call must start only when the destination party picks up the phone (answers the call) !!!
A routing table would be nice
We need a IP to IP call solution.
H323 we prefere.