Installation Instructions

Menu: Ports

ISDN

At this menu external and internal S0-ports are configured

Settings

Your telephone system has up to two S0-ports which can be switched to external or

internal. For the external S0, you can choose between a point-to-point and multipoint

interface. If you choose the multipoint interface, you can additionally select „layer 2

always active”. This setting is required by some public exchanges. For a point-to-

point connection, it is additionally necessary to enter the basic number of the tele-

phone system. Enter the extension numbers for the point-to-point connection in the

„Entry MSN/DDI” menu.

Type/Status

For the external S0 you can choose between point-to-point and 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 num-

ber of the telephone system and not that of the caller. However, you can

correct this by having the service „CLIP – no screening“ unlocked by your

telephone network provider. Please note that this service is liable to pay

costs. The telephone system supports this service by the option to pro-

gramme any outgoing telephone number!

 Two voice channels are occupied and therefore are no longer available for

other calls.

 If no further voice channel is available for call forwarding, forwarding cannot

take place.