[Asterisk-Users] Two PBX

[Asterisk-Users] Two PBX

HELLO everyone I am having two alcatel 4600 digital phone PBXs .. They are situated in two locations 15km apart. I want users or extension in both PBXs to be able to dial and receive calls from each others through those 30 channels in the E1 .. I have line of sight so i am planing to use a