Please advise which will be the best method to follow to reach my goal.
My aim is to link 4 yeastar PBX’s so that they can call each other internally.
I have 4 schools all under one network.
Onsite they have Yeastar PBX’s.
They want to be able to call each other using their extensions internally asif they were all on one PBX.
Please advise how I can resolve this issue
Client using S Series and P series