[asterisk-users] Extension planning

[Nik Engel]

Hi all !

I am currently planning a PBX asterisk installation in our new office.
We will slowly migrate from our old system to the new system, running 
both systems paralel.

My question is now how to plan the extensions:
before we used to have only 2 digit extensions :
like 10, 70 etc. I guess for more flexibility we should use 4 digits ? 
As we will also
have asterisk servers in different countries?
So for one office I could use 1xxx and for the other 2xxx ? Am I on the 
right track?

Nik