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.
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<div><span class="gmail_quote">On 12/5/05, <b class="gmail_sendername">Colin Anderson</b> <<a href="mailto:ColinA@landmarkmasterbuilder.com">ColinA@landmarkmasterbuilder.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">In our dialplan, we use centralized voicemail for SIP, IAX and cell phones.<br>This means, if a caller calls a user's DID, it tries his SIP/IAX extension,
<br>then if he doesn't answer there, it tries his cell, then it goes to Comedian<br>Mail.<br><br>Everything works 100%, except when the user shuts his cell phone off. When<br>that happens, and he doesn't pick up his SIP/IAX extension, it hits his cell
<br>phone, and the cell carrier's default Unavailable message is played.<br>Asterisk detects this as the call being "answered" and completes the call.<br>However, this is undesirable behavior. We want it to go to Comedian mail
<br>instead. Note that this is contrary to what the carrier said would happen.<br>The carrier indicated to us that it would just ring and ring and ring<br>forever, which is what we want. Now they are saying: "too bad, this is the
<br>way it works, deal with it"<br><br>In order to have the desired behavior, there are three options:<br><br>1. Carrier makes it ring forever (not gonna happen)<br>2. I set the call forward/Unavailable on the cell to a DID that points to
<br>Comedian Mail and do some Caller ID stuff to make it go to the right<br>mailbox. This isn't practical from a management standpoint, it would be<br>troublesome and error prone to maintain<br>3. When the cell is off, the carrier's Unavailable message plays right away,
<br>within 2 seconds of the call being dialed. So, somehow magically modify the<br>dialplan so that if a cell is answered within 2 seconds, go to Comedian<br>Mail.<br><br>Of these options, 3) would provide the optimum workaround, but I don't think
<br>it's possible to express this in an Asterisk dialplan.<br><br>Anyone have any advice or dialplan magic on how to do 3) ? ?<br>_______________________________________________<br>--Bandwidth and Colocation provided by <a href="http://Easynews.com">
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