This document provides information on how to configure ISDN BRI for "Anlagenanschluss" in Germany.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware versions.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Refer to Cisco Technical Tips Conventions for more information on document conventions.
In Germany (and possibly in some other countries), local telephone companies offer an ISDN line called "Anlagenanschluss". This line, or very often a "hunt-group" of multiple lines, refers to a group of lines with the same subscriber number. Anlagenanschluss intends to connect only one ISDN device such as a private branch exchange (PBX).
This section describes how you can use these ISDN lines on a Cisco router.
In order to use Anlagenanschluss on a Cisco router, configure the isdn static-tei 0 interface configuration command on the BRI interface(s) as shown here:
Router# configure terminal
Router(config)# interface bri 0
Router(config-if)# isdn static-tei 0
Warning: Interface must be cleared after reconfiguring the TEI.
!--- Issue the shutdown and no shutdown commands !--- to activate new TEI configuration.
Router (config-if)# shutdown
Router (config-if)# no shutdown
Without the isdn static-tei 0 command, the ISDN Layer 2 status gets stuck in the "TEI_ASSIGNED" state, and the output of debug isdn q921 command repeats these two lines:
RX SABMEp c/r = 1 sapi = 0 tei = 0
RX IDCKRQ ri = 0 ai = 0