SARK V4.0.0 Callback
CALLBACK
SARK Callback provides a secure DISA (Direct Inward System Access) type facility. DISA is designed to allow external users to dial into the PBX and receive dial-tone so they can dial out and have the onward 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 and SARK has a feature like this.
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. This is quite a secure feature because it can only ever give dial-tone to authorised CLIs and it also carries ALL of the cost including the leg back to the original caller.
set-up
First of all you need to nominate an inbound trunk or DDI as a callback trunk (you can have as many as you like); you simply create a DDI and choose 'CALLBACK' from the route dropdown.
