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TAU-4M.IP Subscriber gateway
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3.2
Call Waiting
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 line settings menu by selecting
'Attended calltransfer'
,
'Unattended calltransfer'
, or
'Local Calltransfer'
in
'Flash mode'
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;
R 2—switch to new call (change a subscriber);
R – short clearback (flash).
3.3
Three-way conference
Three-way conference is a service, that enables simultaneous phone communication for 3 subscribers. For
entering conference mode, see Section 3.1 Call Transfer.
Subscriber that started the conference is deemed to be its initiator, two other subscribers are the
participants.
Two modes are available: local and remote. In the first mode, the conference is assembling locally by the
initiator subscriber; in the second, the conference is established using a remote server, the so-called conference
server.
3.3.1
Local conference
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 3.1
Call Transfer and
