SARK V4.0.0 Callback
SARK Callback provides a secure DISA(Direct Inward System Access) type facility. DISA is designed to allow external users to dial in to the PBX and receive dial-tone so they can dial out and have the on-call charged to the PBX. Obviously, such a service could be abused if it were offered without some kind of security. traditionally this has involved the use of a password or PIN. Callback is a little different. How it works is this. A user calls into the a nominated "callback" DDI. The call is ended immediately by the PBX without ever going off-hook. The PBX then looks up the CLID of the caller in an authorized list and, if it appears, calls back to the same phone and gives the caller dial-tone. First of all you must define each user to the system and register their caller-id (CLI). Next you nominate an inbound trunk or DDI as a callback trunk; you simply choose 'CALLBACK' from the route dropdown.
