Configuration menu: ISDN access
47
Configuration menu: ISDN access
Menu: Settings
Your telephone system has 4 S0 connections with ports 1 to 4. Because port 4 is al-
ways an internal S0 connection, it is listed here but cannot be modified. Ports 2 and 3
may be used as internal or external using jumpers as required, while port 1 can only
be operated as external S0. For the external S0, you can choose between a point-to-
point or multipoint interface. If you choose the multipoint interface, you can addition-
ally select “layer 2 always active”. For a point-to-point connection, it is additionally
necessary to enter the basic number of the telephone system. Enter the extension
numbers for the point-to-point connection in the “enter MSN/DDI” menu.
Note:
You have to restart the telephone system manually after changing from
point-to-point to multipoint interface or vice versa.
Note:
When using the optional 4S0 module the interfaces 5 - S0 8 are dis-
played.
Type/Status
For the external S0 you can choose between point-to-point or multipoint interface.
Layer 2 always active (only with multipoint access)
If you have chosen a multipoint interface, you can additionally define whether the
connection to the switchboard shall always remain active (layer 2 always active).
Thus, the connection can be monitored via the switchboard. With a point-to-point ac-
cess, layer 2 is automatically always active.
CD external
If a subscriber activates call forwarding to an external destination, an external caller is
normally diverted via a second voice channel (B-channel). This has the following dis-
advantages, however:
•
The external destination receives CLIP information containing the call number of
the telephone system and not that of the caller.
•
Two voice channels are occupied and therefore are no longer available for other
calls.
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