CUCM Extensions in 0000-0999 range - Can they be used?

[dudecrush]

All - Just posted this to TAC, but thought I'd throw it out there for a real-world insight....

We're currently running 11.5.1.14900-11 for our Cisco Call Manager and 11.6.2.10000-38 (ES02-28) for UCCX. We have a block of extensions in the 0000-0999 range that are unused.

Can that range be used as telephone extensions in CUCM or as triggers/CTI route points for UCCX? I can't see any reason why they cannot be used, but am worried there are caveats do using them.

As an experiment, I created extension "0000" and attached it to my phone. I was able to call that extension internally with no problem. I don't see why I couldn't attach numbers in that range to a translation pattern or as a CTI route point/trigger in UCCX.

Any help or insight would be appreciated.

 

[gnrslash4life]

You can use whatever extensions you want. It just all depends on your dial plan configuration as to whether itll work correctly or not.

Certifications:
A+
Network+
CCENT
CCNA Voice
CCNP Voice

 

[dudecrush]

Thanks. That was the confusing part. If I go to Call Routing > Dial Plan Installer, there are no dial plans listed. Our call center has route-patterns that begin with *00XX, but that * at the beginning makes the route plan specific and eliminates any pattern matching that might occur.

 

[dudecrush]

Forgot to mention - TAC also said that we could use those extensions.

 

[gnrslash4life]

Dial Plan is your entire systems configuration for dialing. Its not a menu you click.

Certifications:
A+
Network+
CCENT
CCNA Voice
CCNP Voice

 

[thepfy]

The best way to check of number usage is Call Routing -> Route Plan Report.
Then you will be able to see if there are any overlaps or conflicts.

 

[dudecrush]

thepfy - Thanks. Prior to posting this thread, I did run through the numbers looking for conflicts. Per your advice (something I should have thought of), I checked the route-plan report, and there were no overlaps.

I figured they could be used, but thought I'd ask. The back-story to this thread is that I've seen 0000-0999 go unused at multiple companies. I had assumed that it was because no one wanted an extension that started with a zero. But I'd seen it so often I began to question myself and wonder if I was not understanding something. I knew that dial plans could make a difference, but I'd never seen call / park pickup codes and other codes in the 00xx range.