Specifications

Connecting to an Internal PBX Bus

64 ISDN-Controller B1 PCI v4.0 – 13 Special Types of Lines

13.2 Connecting to an Internal PBX Bus

The ISDN-Controller B1 PCI v4.0 can be operated smoothly

on internal S

buses of telecommunications PBXs. The

CAPI 2.0 drivers supplied with the software support the D-

channel protocols DSS1 (Euro-ISDN), NI1, 5ESS and 1TR6.

Note the following for operation at an internal bus of a PBX:

 The D-channel protocol of the PBX at the internal S

bus must be the same as the one selected during the

ISDN-Controller installation.

 A number of PBXs require that the ISDN terminal de-

vice (the ISDN-Controller, for example) signal a certain

MSN for outgoing calls. This MSN is generally the inter-

nal extension number rather than the (collective) num-

ber of the PBX. For details, see your PBX manual. If this

MSN is not signaled or is signaled incorrectly, it is not

possible to establish a connection over the PBX. The

MSN signaled for outgoing calls is always configured

directly in the CAPI 2.0 application (such as FRITZ!)

rather than in the CAPI 2.0 driver. This is also the case

for the system drivers of the AVM Middleware product

series, such as the NDIS WAN CAPI Driver or the CAPI

Port Driver. Here the outgoing MSN must also be con-

figured directly in the system drivers.

In many cases charge-calculation software provided by

the PBX manufacturers is also dependent on the sig-

naling of the correct MSN by the ISDN terminal device.

 The ISDN service indicator desired by the CAPI 2.0

application (for example DATA64K, speech, 3.1 kHz

audio) must be available for terminal devices at the

corresponding extension. This generally depends on

the configuration of the PBX software.

 If the ISDN-Controller or the CAPI 2.0 application using

the ISDN-Controller are to accept calls (from Dial-Up

Networking Servers or routers, for example), the exten-

sion must also be configured for incoming calls. If mul-

tiple terminal devices installed on the internal S

bus

are configured for the same ISDN service indicator (for