System Functions and Features as of I7.9
182 Call routing
syd-0200/3.0 – I7.9 – 11.2009
Indirect Network Access
The PBX is connected to a specific network (network A). The destination network
(network B) is reached indirectly via this network. This case occurs frequently.
Fig. 79 Indirect access to network B via network A using LCR
For indirect access the phone number dialled must contain the following informa-
tion:
• Call number of the destination user.
• Network provider required (in the example network provider B).
• The code information (in the example for network provider B) used by B to check
whether the caller is a subscriber to his network.
Network provider A can respond to the call in the following way:
• He either routes the destination number on directly using his own numbering
plan.
• He takes the call and waits for code information, such as the destination number,
to be transmitted by the caller in DTMF mode.
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