August 2005
Intermediate to advanced
798 pages
31h 12m
English
isdn caller — interface
isdn callerphone-number[callback] no isdn callerphone-number[callback]
ISDN caller ID screening
Disabled
If your ISDN switch supports caller ID, this command lets you specify a phone-number from which incoming connections are allowed. If the inbound call does not originate from this number, it will be rejected. You may use the letter x in the phone number as a wildcard character; for example, 458-xxxx means “any number in the 458 exchange.” The callback keyword causes the router to reject the call and initiate a callback to the caller’s number; this feature may help you manage phone costs.