Matrix PRASAR UCS - Page 608

Matrix PRASAR UCS System Manual 599
• The system matches the CLI of A with the Call Back Incoming Number List assigned to SIP Trunk -1 to
determine if the calling number is eligible for a call back.
• A match is found on Index 15 of the Call Back Incoming Number List.
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• The system waits for the period of the Call Back Timer (programmable, default: 10 seconds).
• A must disconnect before the expiry of the Call Back Timer so that the system can treat it as a Missed Call.
• If A disconnects within the Call Back Timer, the system applies Call Back for A’s number.
• The system checks the ‘Call Back on’ parameter, whether it has to call back the same number or an
alternative number.
• If an alternative number is programmed as ‘Call Back on’, the system checks the Outgoing Call Back
Number List for the alternative number. As the CLI of A matches with the number on Index 15 of the Call
Back Incoming Number List, the system checks Index 15 of the Call Back Outgoing Number List for the
corresponding alternative number to this number.
• The system checks if the number is to be called from the same port or an OGTBG.
• If the same port is programmed, the system will make a call to the number using SIP Trunk -1.
• If OGTBG is programmed, the system will check if Least Cost Routing is enabled in the OGTBG and make
the call back accordingly.
• When A answers the call,
• The system checks the type of Call Back Mode enabled on SIP Trunk -1 (the port on which the call back
request was made).
Following scenarios are possible:
1. 'Pin Authentication - Multiple Calls' or 'CLI Authentication - Multiple Calls' is enabled as Call Back Mode
on SIP Trunk -1.
• A gets dial tone of PRASAR UCS.
• A can now reach any station or trunk of PRASAR UCS from DISA Mode.
2. 'CLI Authentication - Single Call’ is enabled as Call Back Mode on SIP Trunk -1.
• A gets dial tone of another trunk of PRASAR UCS.
• A can make calls from the trunk.
3. ‘Operator’ is enabled as Call Back Mode on SIP Trunk -1.
• A gets Ring Back Tone.
• The system lands the call on the Operator extension assigned to SIP Trunk -1.
89. If the system does not find a match for the CLI of the caller in the Call Back Incoming Number List, the 'Call Back' feature will not
be applicable and the call will be processed according to the normal incoming call logic.