[Asterisk-Users] Dialplan question

[Simon Brown]

Does anyone know how to do the following:

1. Caller calls in
2. Asterisk answers.
3. Asterisk rings nominated extensions
4. Caller keys in certain digits while extensions are ringing
5. Caller is directed to another extension based on the digits keyed in

I can achieve this if I have Asterisk play a background message after
answering and before ringing the extensions (between steps 2 & 3).  But I
cannot get it to work if the extensions are rung straight away.

Any help would be greatly appreciated.

Simon Brown