[Asterisk-Users] Asterisk forwarding confirmation?

[John Millican]

> Hi; I've been using Asterisk for a few months now, and I have run into
> an interesting issue that I thought someone else in the community may
> have run into:
>
> I have an Asterisk install set up to receive helpdesk calls, route
> them to several IAX extensions and an extension which is simply a
> forwarded call over the POTS to a cellphone, so that if no one is
> logged into their IAX extensions for whatever reason, the call would
> go to a cellphone. Ideally, I'd like it to move onto the next part of
> the dialplan if the cellphone isn't answered.
>
> Unfortunately, it turns out that most (if not all cellphones) have
> voicemail, which appears to Asterisk as though it had connected with a
> person, and it then connects the call. I had wanted to put in a small
> AGI application (or something similar) which asked for a single
> keypress to confirm that someone had actually picked up the phone
> call, but it seems as though using an AGI script would simply prompt
> the caller. Has anyone else had this sort of problem, and is there a
> way around other than creating call files and attempting to connect
> them with the incoming call?
>
> Thanks,
> Jeff Buchbinder

Might be a cluedge work around but it seems to me you could ask the user for a 
key press and set a var based on receiving the keypress or not.  Something to 
the effect of:
exten => x,x, Dial(cell_phone,20);
exten => x,x, Read(var|voice_prompt|1);
exten => x,x, GoToIf($[${var} = 9]?extension if key pressed:extension if key 
not pressed);
Voice prompt should say "blah blah press 9 to accept this call".
Read wiki for the Read and the GoToIf commands.