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NTU Optical Network Terminals 67
APPENDIX B. ADDITIONAL SERVICE
1. Call Waiting
The service uses a definite signal to notify user about a new incoming call when the line is already busy
with another call.
Having received the signal, the user may decide to pick up the waiting call.
The service can be chosen by setting Call waiting flag in the VoIP/SIP Advanced Setting menu (see section
4.3.2 SIP Advanced Settings submenu).
Service usage:
When you receive the new call notification while you are already talking, press R to hold the current call
and take the waiting one. All further pressing R button will be processed according to the algorithm described in
sections 2 Call transfer and 3 Conference.
– R – flash.
2. Call transfer
The Calltransfer service allows temporary interruption of connection with active subscriber (subscriber A),
connection to another subscriber (subscriber C), and transfer of the call with disconnection of subscriber B (the
subscriber providing the service).
Service usage:
While being connected to the subscriber A, hold the call by pressing the flash release (R), wait for the
station response signal, and dial the subscriber C. When the subscriber C answers your call, hang up.
3. Conference
Conference is a service allowing three and more subscribers to have shared phone conversation. The
service can be chosen by setting Call waiting flag in the VoIP/SIP Advanced Setting menu (see section 4.3.2 SIP
Advanced Settings submenu).
Service usage:
While being connected to the subscriber A, hold the call by pressing the flash release (R), wait for the
station response signal, and dial the subscriber C. When the subscriber C answers your call, press R to switch to
the conference mode.
The subscriber who starts the conference is a chairperson; the rest two subscribers are participants. When
the chairperson presses flash release in the conference mode, the last called subscriber is disconnected. A
participant may put on hold other participants.
The conference ends when the chairperson hangs up; the rest two participants will receive the release
signal in this case. If a participant leaves the conference, the chairperson and another participant are switched
to a normal two-party call.
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