Sets the number to allow the interface to respond

© 2004 Cisco Systems, Inc. All rights rese^ed. bcran v2.1—6-12

When multiple devices and a router share the same ISDN local loop, you can ensure that the correct device answers an incoming call. This guarantee is accomplished by configuring the router to verify the called-party number. However, the ISDN switch must support the delivery of called-party numbers.

The isdn answerl interface configuration command verifies a called-party number or subaddress number in the incoming setup message for ISDN BRI calls, if the ISDN switch supplies the number. Use the isdn answer2 interface command to verify an additional called-party number or subaddress number. To remove a verification request, use the no form of the command.

All calls are processed or accepted if you do not specify the isdn answerl or isdn answer2 commands. If you specify one of these commands, the router must verify the incoming called-party number before processing or accepting the call. Devices on multipoint ISDN connections are typically assigned a specific subaddress. The isdn answerl command can also verify the incoming call based on the specific subaddress.

You can configure just the called-party number or just the subaddress, in which case only that part will be verified.

The table describes the arguments for the isdn answer 1 command.

isdn answerl [called-party-number][ : subaddress]

isdn answer1 Command

Command

Description

called-party-number

Number supplied in the call setup request.

(Optional) Identifies the number that follows as a subaddress. Use the colon (:) when you configure both the called-party number and the subaddress, or when you configure only the subaddress.

subaddress

(Optional) Subaddress number used for ISDN multipoint connections.

Some service providers require that both isdn answerl and isdn answer2 parameters be specified.

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