Matrix PRASAR UCS System Manual 1021
The Process
• When an extension having RCOC feature in its Class of Service makes an out going call, the system
checks if RCOC is enabled on the trunk through which the outgoing call is routed.
• If RCOC is enabled on the trunk, the system stores the record of the outgoing call in the RCOC Table.
• The system sets RCOC for the outgoing call in the following conditions,
• The Destination Port is a SIP Trunk, RCOC is set when:
• called party is busy.
• called party does not answer the call.
• caller (extension that made the call) goes ON-Hook before the called party answers the call.
• When PRASAR UCS acts as Gateway (RCOC),
• RCOC will be set, if it is enabled on Destination Port.
• RCOC shall be set only if the Calling Party's Number is available. If calling party number is missing,
then RCOC shall not be set.
While returning call to the original caller, if you want PRASAR UCS to match the Trunk Port type and Trunk
Port number of the incoming call with the Trunk Parameters of the entry stored in the RCOC table, then you
must enable Apply RCOC only if the caller calls back on the same trunk from which the call was
made option in the System Parameters.
• Whenever there is an incoming call on any trunk, the system checks the Apply RCOC only if the caller
calls back on the same trunk from which the call was made check box in the System Parameters.
• If enabled, the system matches the Trunk Port number and the Trunk Port type of the incoming call with
the entry stored in the RCOC Table.
• If disabled, the system matches the CLI of the incoming call with the entry stored in the RCOC Table.
• If a matching record entry is found, the system routes the call to the original caller and clears the record
entry from the RCOC Table.
• The return call rings on the original caller's extension for the period of the Ring Back Tone Timer
(programmable; default 45 seconds). If the original caller does not answer the call within this Timer, the call
is routed to the Trunk Landing Group programmed for that trunk.
The Ring Back Tone Timer is common to all internal calls; calls made from one extension will ring on the
destination extension till the end of this timer. Change in the Ring Back Tone Timer for RCOC returned
calls on original caller's extension will also be applied on Ring Back Tone Timer for all internal calls. So,
change this Timer taking this into consideration.
• If no match is found in the RCOC Table or the extension or the original caller is busy, the call will be routed
according to the incoming call logic programmed (as programmed in the assigned Trunk Feature
Template) in the system.
• As RCOC is a “Class of Service (COS)” dependent feature, extensions that are not allowed this feature
in their COS cannot have their calls returned; even if this feature is enabled on the Trunk they used to
make the call.
• In case of Call Transfer, RCOC will be set for the extension on which the call is transfered.
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