Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Attention: The Community will be in read-only mode on 12/14/2017 from 12:00 am pacific to 11:30 am.

During this time you will only be able to see content. Other interactions such as posting, replying to questions, or marking content as helpful will be disabled for few hours.

We apologize for the inconvenience while we perform important updates to the Community.

New Member


Dear all

can anyone explain to me this command and what is used for?

i tried some of the white papers but didnt clarify it


Cisco Employee

Re: num-exp

Number expansion is an older IOS command that was/can be utilized to manipulate dialed digits for outbound calls.

It works by matching the DNIS (called number) and then expanding changing it based on what you configure. After the number expansion has taken place, then the router searches through its dial-peers to find a match for the outbound call.

As an example taken from the IOS Configuration guide.

They have configured the following

num-exp 5.... 1408555....

What will occur in the router is that any 5 digit dnis (called number) will be changed to an 11 digit dial string. So if I dial 51234, then the number that will be dialed by the router will be 14085551234.

Hope that helps.

By the way, the better way to do digit manipulation is through voice translation rules (12.2(11)T and higher)

CreatePlease to create content