asterisk users - Oct 2007 - Hanging up all call on a device via CLI/AMI/AGI

Hello, never posted to a mailing list before. I've been trying to work out
this problem for quite awhile now. I have a PHP script which is run whenever an
emergency situation happens. The script connects to the AMI and originates calls
to previously defined "emergency" extensions. I'm looking for a
way to disconnect all calls on a device if it is in use, in order to deliver the
message. I cannot use SoftHangup with the 'a' option within the dial
plan, because if the device that is called is busy, then the context is never
hit. It doesn't appear that their is a way within the AMI or using AGI or
even within the CLI to disconnect all calls on a device, only is you know the
entire channel name.

For instance, from the CLI, running 'soft hangup SIP/250-ab627038' will
disconnect the channel successfully. But the problem is, I have no way of
finding out the full channel name from within my my script using the AMI. The
only possibility I see is running the "show channels" CLI command via
the AMI Command action, grabbing the resulting list and parsing the Channel Name
column before the script begins calling extensions. Then before each extension
is called, check to see if the extension exists in the retrieved channel list.
If so, disconnect it.

Anyways, it seems odd to me that the 'a' option is available from within
the dial plan, but not anywhere else. That would be the simplest approach to
this.

Any help is greatly appreciated. Thanks.
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