[Asterisk-Users] How to detect call forwarding to voicemail

[Leo Ann Boon]

Eric "ManxPower" Wieling wrote:

>
> Your first question should be "Can the telco inform the calling 
> equipment that the call has been forwarded to voicemail?"  As far as I 
> know, the answer to that is "no".
>
It's possible to detect call forwarding on ISDN. The telco must enable
it for you (for a large recurring fee when I last investigated).
Basically, you need to compare the actual connected number vs the number
that was dialed. I did a POC using an ISDN BRI line provided by Singtel.
My Asterisk setup at that time was Asterisk 1.0.3 with chan-capi.

Hope this helps.