[asterisk-users] Single * multiple offices

[Nhadie]

Hi,

Is what i'm thinking possible, i will setup an asterisk server, i will 
let 2 or more offices use it, e.g.

Office 1 will have extension 100 - 110
Office 2 will have extension 100 - 105
Office 3 will also have 100 - 105

my questions are:

1. will it have conflict on the asterisk having the same extension 
number for each office?

2. can i define trunk/s that will be dedicated only for each office?

3. can i define IVR for each office?

or to summarize it, is it possible to provide all the asterisk features 
on all 3 offices without the offices conflicting with each other.

thank you in advanced

regards,
ron