Ideas for worldwide numbering plan ?? help

[d.pennington]

We have 13 sites and (2) CCM clusters.

Each site is either 4 digit, 5 digit or 6 digit extensions, with some overlap between the 2 clusters.

This overlap forces me to prefix digits when dialing between clusters.

I have a project to switch to 6-digit dialing worldwide.

Are there any best practices out there?

I was thinking of something like a [2 digit site code] + [last 4 of DID]

site1 = 10XXXX

site2 = 11XXXX

site3 = 12XXXX

...

site13 = 22XXXX

[Jaime Valencia]

Yes, go E.164 and make everything easier for the future, specially if you need is for a worldwide deployment.

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