7 SUPPLEMENTARY SERVICE USAGE
7.1 The 'Call Transfer' service
Call transfer service may be performed locally using gateway resources, or remotely using resources of a
communicating device. If the service is performed using resources of a communicating device, the access to 'Call
transfer' service is established via subscriber port settings menu—'PBX -> Ports'—by selecting 'Transmit Flash' value
in 'Flash transfer' field, see Section 5.1.2.4. At that, you should specify the Flash impulse transfer method for utilized
signalling protocol. Service process logics in this case will be defined by the communicating device.
When 'Call transfer' service is performed locally using gateway resources, the access to this service is
established via subscriber port settings menu—'PBX -> Ports'—by selecting 'Attended call transfer', 'Unattended call
transfer', or 'Local CT' in 'Flash transfer' field, see Section5.1.2.4.
'Attended call transfer' service allows you to temporarily disconnect an online subscriber (Subscriber A),
establish connection with another subscriber (Subscriber C) and return to the previous connection without dialling
or transfer the call while disconnecting Subscriber B (a subscriber that performs the service).
'Attended call transfer' service usage:
While being in a call state with a Subscriber A, put him on hold with short clearback flash (R), wait for 'PBX
response' tone and dial a Subscriber C number. When Subscriber C answers, the following operations will be
possible:
– R 0—disconnect a subscriber on hold, connect to online subscriber;
– R 1—disconnect an online subscriber, connect to subscriber on hold;
– R 2—switch to another subscriber (change a subscriber);
– R 3—conference;
– clearback—call transfer. Voice connection will be established between Subscribers A and C.
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