[Asterisk-Users] Detection of extension

[Christophe Sauthier]

This may sound silly but how can I say to asterisk that new number have 
been dialed and that it has to treat these as a new extension ?

I mean: I have received a call, and now I want that asterisk execute the 
command, by example call forwarding, recording... that I can do when I 
dial a precise extension ...

What do I have to do ?
Asterisk "see" the digits, but never uses them as an extension...

Thanks for your help