[asterisk-users] Prevent cell phone voice mail capturing call

[Russell Horn]

Hi,

I've a DID number that gets passed to three internal phones and a cell
phone via my outbound IAX trunk. If the cell phone is off or out of
coverage, its voice mail captures the call.

What's the best way to avoid this? Is there a recommended way to force
the cell phone user to press 1 before the call is passed there ala
google voice? Or is there another way to detect the presence of the
answering machine rather than a human?

Thanks,

Russell.