CUCM 8.6 Migrate from 4 digits to 6 digits numbering plan

I am planning on changing the extension numbering plan for a CUCM 8.6 cluster from 4 digits to 6 digits but I am not sure what is the best way is to automate the task.

Does anyone know any third party tools to simplify this?

Thank you


  • Hi,

    How many extension you have? Changing manually is the best procedure I believe.

  • Manual isnt an option unfortunately. I have over 4000 extension, the business is expecting to grow beyond 10000 users within 2 years.

    0 for outside line

    5 is reserved

    9 is reserved internal use

    1,2,3,4,6,7,8 for internal extensions

  • We did this for a customer. It was a manual process but we did it as part of a migration/upgrade and globalized everything to E.164+ patterns. We built some spreadsheets to update the DNs for us before the import intot he new system.

    The only place people could actually dial 4 digits was internally at a site. Most people use directories to call others and by the time you're dialing 6 digits for an extension, 7-10 digits really isn't that many more (IMHO).

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