7.2 The Call Waiting service
This service allows to inform 'busy' users about new incoming calls with a special signal.
Upon receiving this notification, user can answer or reject a waiting call.
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 and selecting 'Call waiting' checkbox.
Service usage:
If you receive a new call while being in a call state, you may do the following:
– R 0—reject a new call;
– R 1—answer the waiting call and terminate the current call;
– R 2—answer the waiting call and put the current call on hold; Further R 0/1/2/3/4 button actions are
processed in accordance with the algorithm, described in Section 7.1 'Call Transfer' service;
– R – short clearback (flash).
7.3 3-way conference
Three-way conference is a service, that enables simultaneous phone communication for 3 subscribers. For
entering conference mode, see Section 7.1 'Call Transfer'.
Subscriber that started the conference is deemed to be it's initiator, two other subscribers are the
participants. In the conference mode, short clearback 'flash' pressed by the initiator is ignored. Signalling protocol
messages, received from the participants and intended to put the initiator side into hold mode, force this participant
to leave the conference. At that, the initiator and the second participant will switch into the ordinary two-party call
mode.
The conference terminates, when initiator leaves; in this case, both participants will receive clearback
message. If one of the participants leaves the conference, the initiator and the second participant will switch into a
standard two-party call. Short flash clearback is processed as described in Sections 7.1 and 7.2.
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