Call routing
250
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
Call Deflection
Call Deflection (CD) is a supplementary service for ISDN users and is available only
on a point-to-multipoint connection. Call deflection can be used to reroute a call
during the ringing phase. The feature is also provided at the user interface (see "De-
flecting a call during the ringing phase (CD)", page 381).
Partial Rerouting
Partial rerouting (PARE) is a supplementary service for communication system op-
erators and is available only on a point-to-point connection (basic and primary rate
access).
Call Forwarding Procedure
Call Forwarding Unconditional is transferred to the exchange as follows (Fig. 107):
• User B activates a Call Forwarding Unconditional to user C.
• User A calls user B.
• The communication server carries out the Call Forwarding Unconditional locally
in the communication server. 2 channels B are busy
• The communication server activates PARE or CD at the public network provider.
• The network provider takes charge of the Call Forwarding Unconditional; the 2 B
channels are freed.
• User C is called. He is presented with user A’s phone number and the redirecting
information by way of CLIP. At the same time the redirecting information is also
transmitted back to user A (see "Display for Call Forwarding Unconditional",
page 88).
Call charges:
• User pays the call charges up to the call forwarding location in the network.
• User B pays the call charges from the call forwarding location to user C.
Call Forwarding Functions Supported
The system routes the following call forwarding to the exchange:
• Call Forwarding Unconditional (CFU)
• Call Forwarding Busy (CFB)
• Call Forwarding on No Reply (CFNR)
• Call Deflection (CD) by a user (forwarding a call during the ringing phase)
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