search for: devicetech

...ter-context=regcontext etc then upon registry, (context,exten) = (<onregister-context>,<user>,1) will be invoked and on unregister the (unreg-<onregister-context>,<user>,1) is invoked So on unregister 'unreg-' is prefixed to the onregister_context The variable ${DEVICETECH} contains the technology of the device registering. To rebuild the unique channel id from this, you would use ${DEVICETECH}/${EXTEN} which for example would return SIP/1000 in the case of that device registering -Chris