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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 or if you have CAS enabled, select one of the three available:


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, 17-31 (2 bytes)

NI D-channel protocol:

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


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.

Upon selection of CAS at Configuration/PRI/Physical and performing the required reboot, following different options are displayed:



  • E1_R2D: refers to the ITU-T standard Q.421-Q.422.
  • E1_3BIT: refers to an iranian standard, which is similar to E1_R2D
  • T1_WINK_START: refers to ANSI/TIA-464-C and works only with T1 (see Configuration/PRI/Physical)

assign channels from top

channels will be assigned from top (first used channel 30 with E1 or 24 with T1).

channel bank mode

in the channelbank mode, each CAS channel is fixed assigned to a telephone number and is not dynamically assigned as in trunk scenarios. The CAS interface then is connected to a channelbank. E.g. telephone with number 1 calls to the CAS interface, channel 1 is taken for this call. If telephone with number 3 calls, channel 3 is taken and so on (this is normally done with maps in the routing table). In the incoming direction its similar. If a call comes in on channel 1, it is transferred to the telephone with number 1 (or via maps in the routing table).

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