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How to configure Network Side ISDN PRI Signaling for PBX in a Cisco IOS gateway

Core Issue

The Network Side ISDN PRI Signaling, Trunking, and Switching feature enables    Cisco IOS  Software to replicate the public switched network interface to a PBX    that is compatible with the National ISDN (NI) switch types and European Telecommunications    Standards Institute (ETSI) Net5 switch types.

Routers and PBXs are both traditionally Customer Premises Equipment (CPE) devices    with respect to the public switched network interfaces. However, for VoIP applications, it is desirable to interface access servers to PBXs with the access server representing the public switched network.

Resolution

To configure the Network Side ISDN PRI Signaling, Trunking, and Switching feature,    ensure that the selected access server is in this condition:

  • The T1 or E1 controllers are operational and configured for ISDN PRI.
  • The D-channel interfaces are operational and configured for ISDN PRI.
  • Each D-channel interface is configured with the isdn incoming-voice modem      command.

For example, the selected PRI interfaces might have a configuration similar    to this:

interface Serial1/0/0:23
  no ip address
  no ip directed-broadcast
  isdn switch-type < >
  isdn protocol-emulate network
  isdn incoming-voice modem

For more details about Network Side ISDN PRI Signaling, refer to Configuring Network Side ISDN PRI Signaling, Trunking, and Switching.

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