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VoIP subscriber gateways
Figure below shows
'Unattended calltransfer'
service operation algorithm:
’Local
calltransfer’
service allows you to transfer call through a gateway without sending an external
REFER message if C subscriber is a local TAU client and its call was directly performed with ignoring of the proxy
server. If C subscriber is external or local client which was called via proxy server,
‘Local
calltransfer’
service
operates like
‘Attended
calltransfer’
service and call transfer is performed by sending REFER message to the B
subscriber.
5.2
Call Waiting
This service allows you to inform "busy" subscribers about new incoming calls with a special signal.
Upon receiving this notification, user can answer or reject waiting call.
Access to this service is established via subscriber line settings menu by selecting
'Attended calltransfer'
,
'Unattended calltransfer'
or
'Local calltransfer'
in the
'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.
