scriber is performed in the system.
Call forwarding to an internal number is performed in the system. If an internal call to an ex-
ternal number is to be forwarded, forwarding also occurs in the system. Here, the connec-
tion is on the bundle cleared for the subscriber doing the setup. If call forwarding occurs via
an ISDN connection, one B channels remains in use; in case of forwarding from external to
external, it's both B channels. Two possibilities exist for call forwarding of an external call to
an external number:
• Call forwarding in the exchange: Call forwarding is conducted at the exchange if only one
subscriber is entered in the call allocation for an external call. For call forwarding in the
exchange, the performance features Call Deflection (point-to-multipoint connection) or
Partial Rerouting (point-to-point connection) must be enabled with the network operator
for the relevant ISDN connections.
• Call forwarding in the system: Call forwarding occurs in the system if the required per-
formance features for call forwarding at the exchange are not available for the relevant
ISDN connections. If several telephones (e. g. a team), some of which have set up call
forwarding, receive an external call, the corresponding call forwarding is performed in the
system. Here, the external connection is set up over a bundle's B channel, cleared for the
subscriber initiating the setup. This B-channel remains assigned for the duration of active
call forwarding.
Note
If the system is connected to the external ISDN, for external-to-external connections,
the system systematically attempts to initiate call forwarding via the exchange For
teams, there can be manual definition of whether call forwarding shall occur via the ex-
change or the system. If the system possesses no ISDN connections, or if Call Deflec-
tion (point-to-multipoint connection) or Partial Rerouting (point-to-point connection) has
not been ordered from the network operator, call forwarding occurs solely in the sys-
tem.
16.1.2.1 Edit or New
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16 Call Routing
bintec elmeg GmbH
268
elmeg hybird 120 / hybird 130
