isdn answer2 [called-party-number][:subaddress]
no isdn answer2 [called-party-number][:subaddress]
called-party-number (Optional) Telephone number of the called party. At least one value—called-party-number or subaddress—must be specified. The maximum number of digits for called-party-number is 50. : (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. At least one value—called-party-number or subaddress—must be specified. The maximum number of digits for subaddress is 50.
To have the router verify a called-party number or subaddress number in the incoming setup message for ISDN BRI calls, if the number is delivered by the switch, use the isdn answer2 command in interface configuration mode. To remove the verification request, use the no form of this command.
If you do not specify the isdn answer1 or isdn answer2 command, all calls are processed or accepted. If you specify the isdn answer1 or isdn answer2 command, the router must verify the incoming called-party number and the subaddress before processing and/or accepting the call. The verification proceeds from right to left for the called-party number; it also proceeds from right to left for the subaddress number.
You can configure just the called-party number or just the subaddress. In such a case, only that part is verified. To configure a subaddress only, include the colon (:) before the subaddress number.
You can declare a digit a "don't care" digit by configuring it as an x or X. In such a case, any incoming digit is allowed.
In the following example, 5552222 is the called-party number and 1234 is the subaddress:interface bri 0 isdn answer1 5552222:1234 In the following example, only the subaddress is configured: interface bri 0 isdn answer1 :1234
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