[Asterisk-Users] Separating Asterisk SIP extensions from dialing each other.

[Rick Smith]

This is coming from an * noob. :)

I've got two customers, they both are replacing their phone systems with 
VOIP, and we need to retain both their existing dialplans.

One has 5 extensions starting at 100, and the other has 10 extensions, 
starting at 100.

Is there a way to have the same extension number twice in the same 
asterisk system ?

They will have different incoming DIDs of course.

I don't want them to be able to see / hear / feel / dial each other 
internally, either.  They must remain completely independent.

If anyone's got pointers in a Wiki or PDF somewhere, let me know.

Thanks