Tutorials: SIP Trunk Setup
This tutorial will help you to configure a Voxtelesys SIP Trunk on Issabel PBX.
Disclaimer: This setup will also work with older versions of Elastix. Issabel PBX is a fork of the older Elastix PBX, this guide will work for configuring Elastix as well.
Last Updated: 5/21/2025
Under the "PBX" tab, select "PBX Configuration" from the drop-down menu.
On the "PBX Configuration" page, select the "Trunks" option.
Click on the "+ Add SIP Trunk" button.
Enter the following under "General Settings"
Trunk Name: Voxtelesys
Outbound CID: Number from Voxtelesys
Enter the following under "Dialed Number Manipulation Rules:"
Match Pattern 1: NXXNXXXXXX
Match Pattern 2: 1NXXNXXXXXX
Enter the following:
Trunk Name: OB_Voxtelesys
Enter the following under PEER Details:
username=Username from Voxtelesyssecret=Password from Voxtelesyshost=Domain/host from Voxtelesystype=friendinsecure=port,invitequalify=yesdisallow=allallow=ulaw&alaw
Enter the following
USER Context: IB_Voxtelesys
Enter the following under "USER Details:"
qualify=yesRegister String: Username:Password@Domain
Submit and Apply, then your trunk will register!
To check, you can go to PBX > Tools > Asterisk CLI
Enter the command:
sip show registry
