Is there any plans for a generic SUBSCRIBE event handler in Asterisk (in addition to the Presence stuff)? It need not be something as complicated as internal support. Simply a way to launch an external program in response to an event would be useful.
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With that I could write my own support. For example, the polycom phones support for 'x-as-feature-event+xml' which is used for Server-Based Call Forwarding and DND. If asterisk simply sent on the entire UDP SUBSCRIBE packet to whatever program was specified in the extensions.conf or features.conf. For example, 'extern-event-handler = /var/lib/asterisk/eventcode/myhandler.pl'. I could then write a perl script to do whatever with the information. In this case, I'd parse the XML and set the server side stuff up. Just an idea. It should be relatively easy to program as it pushes the complex (and phone vendor specific) stuff to the external program and outside the asterisk code base.