在依赖于某种截获拨号识别码的方法前尽可能的测试各种方法。
以下的方法只在某些地区可用，并非所有地区都可用的。

Dial *67 before you dial the number. (141 in the United Kingdom)
Dial your local TelCo and have them add Caller-ID block to your line.
Dial the 0 Operator and have him or her place the call for you.
Dial the call using a pre-paid phone card.
Dial through Security Consultants at (900)PREVENT for U.S. calls
($1.99/minute) or (900)STONEWALL for international calls ($3.99/minute).
Dial from a pay phone. :-)