[Asterisk-Users] Looking for advice on cell carrier's default "Un avaliable" message

[Colin Anderson]

Neat macro but not quite what I'm looking for if I force call recipients to
press 1 to accept a call they will scream bloody murder. Good idea though. 
 
-----Original Message-----
From: Joe Pukepail [mailto:pukepail at gmail.com]
Sent: Monday, December 05, 2005 10:20 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Looking for advice on cell carrier's default
"Un avaliable" message
 
Look into the findme feature, this will require the person receiving the
call to push a button "hit 1 to accept this call" before a call gets
transfered to a cell phone (or home phone for that matter), if nobody hits
"1" it continues in the dialplan, this will prevent calls from being
transfered to cell phone voicemail or the caller getting the unavailable
message from the cell phone carrier. 
On 12/5/05, Colin Anderson < ColinA at landmarkmasterbuilder.com
<mailto:ColinA at landmarkmasterbuilder.com> > wrote: 
In our dialplan, we use centralized voicemail for SIP, IAX and cell phones.
This means, if a caller calls a user's DID, it tries his SIP/IAX extension, 
then if he doesn't answer there, it tries his cell, then it goes to Comedian
Mail.

Everything works 100%, except when the user shuts his cell phone off. When
that happens, and he doesn't pick up his SIP/IAX extension, it hits his cell

phone, and the cell carrier's default Unavailable message is played.
Asterisk detects this as the call being "answered" and completes the call.
However, this is undesirable behavior. We want it to go to Comedian mail 
instead. Note that this is contrary to what the carrier said would happen.
The carrier indicated to us that it would just ring and ring and ring
forever, which is what we want. Now they are saying: "too bad, this is the 
way it works, deal with it"

In order to have the desired behavior, there are three options:

1. Carrier makes it ring forever (not gonna happen)
2. I set the call forward/Unavailable on the cell to a DID that points to 
Comedian Mail and do some Caller ID stuff to make it go to the right
mailbox. This isn't practical from a management standpoint, it would be
troublesome and error prone to maintain
3. When the cell is off, the carrier's Unavailable message plays right away,

within 2 seconds of the call being dialed. So, somehow magically modify the
dialplan so that if a cell is answered within 2 seconds, go to Comedian
Mail.

Of these options, 3) would provide the optimum workaround, but I don't think

it's possible to express this in an Asterisk dialplan.

Anyone have any advice or dialplan magic on how to do 3) ? ?
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