Plan and Assign Extensions

Before you connect the Yeastar S-Series VoIP PBXs, you need to plan and assign extensions for the headquarter and the branch offices.


  1. Log in to PBX web interface, go to Settings > PBX > General > Preferences.
  2. In the Extension Preferences section, change the User Extensions to the desired range.

    • Headquarter PBX: 1XXX (4-digit extension number starts with 1)
    • BranchA PBX: 2XXX (4-digit extension number starts with 2)
    • BranchB PBX: 3XXX (4-digit extension number starts with 3)
  3. Click Save.

What to do next

Create and register extensions on headquarter PBX and branch office PBXs.