As a result of my frugality, I got my hands on an Adtran Atlas 550 to be used for partitioning a single PRI into two PRIs at my workplace. In addition to the partitioning, this system provides the added bonus of dynamic number substitution. What’s this mean for me? Substituting costly 411 directory service for free Goog-411 service (which I prefer over traditional 411). I’m also able to create a number rejection list to block those NSFW 900* calls [or variation thereof], but the number substitution templates seem much more interesting…

How to do it:

• Telnet to yohost.yodomain and log-in
• Dial Plan > Network Term > Interface # (1 in my case) > Enter
• Select Substitution Template
• Enter the Original DNIS number (the phone number originally dialed)
• Enter the Substitution DNIS number (the phone number you’d like to dial)
• Go back to the main menu and log-out

Remember, this change is transparent (and instant — no need to write/commit the config to startup), so the next time callers decide to hit up the 411 directory service, their call should be automagically routed to 1-800-goog411 (1-800-4664411). Since we’re a fairly small office I don’t think this number substituion presents a problem with Googles Terms of Service, but if you’re considering this change on a massive scale  I’d consider reading over Google’s TOS agreement (particularly section 5.3).