Select "SIP Trunks"
Select your Voxtelesys SIP Trunk and edit.
Update the following under your SIP Trunk:
Registrar/Server/Gateway Hostname or IP: IP Address Provided by Voxtelesys
Number of SIM Calls: Call limit with Voxtelesys
Type of Authentication: Do not require - IP Based
Authentication ID (aka SIP User ID): Leave blank
Authentication Password: Leave blank
You may need to create firewall rules to support traffic from our IP address to your PBX system.