[Asterisk-Users] Announcement to caller when called party has picked up - without initial Answer()?

[Peter Svensson]

On Mon, 31 Jan 2005, Remco Barende wrote:

> What you want is impossible!
> 
> How can you expect Asterisk to play a message to the caller without 
> answering the phone?

It can be done on isdn connection and over VoIP links as well. The reverse 
audio path is (can be) opened before the answer. The answer allows the 
forward path to be opened.

E.g. you can use Playback(someFile|noanswer) to play a custom busy message 
without answering the line on isdn.

Dial() application will answer the incoming line once it is ready to
bridge the two calls together. If nothing else then one can always modify
the Dial() application to play a specific sound just prior to sending the 
answer. I have not checked if there already is a generic way to hook into 
Dial that early.

Peter