Reference:Configuration/BRI/Protocol

In the Protocol submenu, you can set the protocol to be used for the ISDN interfaces. From the six available protocols, select the one that is best suited to your environment:

Euro ISDN D-channel protocol:

• EDSS1: This type of signalling has gained worldwide acceptance for ISDN subscribers and, despite the name, is also common outside Europe.

QSIG D-channel protocol:

This is a standardised signalling method that is mainly used to connect PBXs. Here, basic call and tunnelling are supported by the gateways. This allows, in particular, homogeneous PBX systems to be linked with QSIG (1 byte), in which manufacturer-specific properties are exchanged via QSIG. Unfortunately, there are several variants of the QSIG standard and various implementations; some conform more and some less to the standard.

The gateways therefore support two different variants.

• QSIG ECMA1: Numbering of the channels from 1-30 (2 bytes)
• QSIG ECMA2: Numbering of the channels from 1-15, 17-21 (2 bytes)

NI D-channel protocol:

• NI: USA (National ISDN 1)
• 5ESS: USA (AT&T)
• DMS100: USA (new standard)

Mode:

If your trunk line is a point-to-point type, select Point-to-Point. If it is a point-to-multipoint connection, then select Point-to-Mulitpoint. This setting is irrelevant for permanent connections. If the connection is operated in mixed mode (one B channel permanently used for a fixed connection, one B channel in dial-up mode), the setting depends on the operating mode of the dial-up line (only TEL1-4 and PPP).

• Point-to-Point: Switches on the point-to-point connection.
• Point-to-Multipoint: Switches on the point-to-multipoint connection.