Bedienungsanleitung ZyXEL Gateway 400 (Seite 29 von 68) (Englisch)

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Configuration | Gateway 400 User Guide

5.5.5 ISDN

This screen dialog allows you to define the connection type of the individual ISDN S0 interfaces. Click

on the pencil icon to edit the settings.

VoIP Account: Optionally, the ISDN interface may also be assigned a VoIP account. See "VoIP

Accounts" on page 27.

If a VoIP account is assigned, only this account is used for the ISDN interface.

If no VoIP account is assigned, the ISDN interface is not used, since no routing is

possible. Alternatively, the VoIP account can be assigned to the ISDN interface as

described in “Interface Mapping” on page 29.

Connection type: Here you can select the connection type to be used for the ISDN interface. This set-

ting depends on which connection types are supported by the ISDN hardware.

For a point-to-point connection, you can directly dial the extension (DID or DDI) by

adding the extension number to the main call number.

For a point-to-multipoint connection, a terminal device is assigned one or several

call numbers (Multiple Subscriber Number, MSN), typically up to the maximum

number of 10 per ISDN connection.

Bus Mode: point-to-point connections always require an extended passive bus.

Point-to-multipoint connections typically use a short passive bus. An extended pas-

sive bus is used if the point-to-multipoint connection covers a distance of more

than 200 meters. At distances of more than 500 meters, no more than one terminal

device may be connected. See "Installation diagram for S0 bus" on page 18.

Interface: In this drop-down list, you can select the ISDN interface of the Gateway 400.

Group membership: The group membership enables multiple ISDN lines to be combined into a

group.

Echo Canceller: VoIP transmissions can be subject to unwanted echo and feedback. In such cases,

echo cancellation may solve the problem.

Activate: Select the check box to enable this configuration.

Layer 2 permanently active: For ISDN connections, layer 2 is required for connection control. Switch-

ing the layer to “permanently active” prevents it from entering into power saving

mode. This adjustment may be necessary if you encounter problems with outgoing

calls (no ringback tone for outside line seizure).

Click Save to store the settings in the Gateway 400.

5.5.5.1 Interface Mapping

The left column contains the configured VoIP accounts. The individual rows represent the VoIP ac-

counts, and the columns represent the four available ISDN interfaces. The check boxes in this matrix

can be used for mapping VoIP accounts to ISDN interfaces.

If multiple VoIP accounts are to be mapped or assigned to one ISDN interface, the check box Allow

more than one VoIP account for each ISDN interface must be selected.

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