Tutorials: SIP Trunk Setup

Required Access: FreePBX

Last Updated: 5/7/2025

Under the "Connectivity" tab, click on "Trunks" from the drop down.

Select "+ Add Trunk" and select "+ Add SIP (chan_pjsip) Trunk" from the drop down.

Select the following:

Trunk Name: Voxtelesys

Outbound CallerID: Number from Voxtelesys

Maximum Channels: Line limit from Voxtelesys

Change to the "Dialed Number Manipulation Rules" tab.

Match the rules below:

Prepend: 1 | Match Pattern: NXXNXXXXXX

Match Pattern: 1NXXNXXXXXX

Match Pattern: 911

Match Pattern: 922 Test dial 911 to verify address

Match Pattern: 011. International calling

Change to "pjsip Settings" tab.

Select the following under the "General" tab in "pjsip Settings:"

Username: From Voxtelesys

Secret: From Voxtelesys

SIP Server: From Voxtelesys

Change to the "Advanced" tab under "pjsip Settings"

Select the following in the "Advanced" tab under "pjsip Settings:"

From Domain: Same as SIP Server from Voxtelesys

Change to the "Codecs" tab under "pjsip Settings"

Set the following codecs in this order:

ulaw

alaw

g729

Submit and apply your configuration.