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.
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.
Username: From Voxtelesys
Secret: From Voxtelesys
SIP Server: From Voxtelesys
*Change to 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.