FreePBX: Add Extension
1. Application > Extensions

2. Select + Add Extension
Add a new SIP [Chan_pjsip] Extension

3. General Extension Info
User Extension: Extension Number
Display Name: Name of user
Set Destination: Pick where this number will route: Extension, Call Queue, IVR, etc.

optional: Set up voicemail
4. Voicemail
Enabled: Yes
Voicemail Password: Create strong pin

5. Submit and apply config
If you need help configuring your trunk or inbound numbers check out the guides below! More Voxtelesys Portal Guides here!
For more FreePBX Guides, click here!