The SIP Trunk is pretty much the modern equivalent of an old school T1 line. It allows you to do the following:
set up a dedicated pathway from one PBX to another.
U can bond a phone number to the PBX which since it is not bound to a physical location, allow you to keep the same phone number if you have to move offices without having to mess with call forwarding.
Here is the main SIP Trunk page. You can search for the needed trunk in the search bar on the left hand side of the screen and you can add a new SIP Trunk by clicking the ADD button.
When you select the ADD button, a small screen will pop up.
Here you enter the specifics of the new SIP Trunk.
Name is the name of the SIP trunk
Domain is the domain the SIP trunk is attached to
Description describes what the sip is doing, where it is going, etc.
Relay media allows you to move not just voice traffic but also video and picture data back and forth on this SIP Trunk. Can be set to Yes, No, or Don’t Care.
Trunk Type allows you to select how the trunk functions. Bidirectional, Locked, Organization only, and Termination only.
IP Control is set to static IP and you enter the static IP you need in the IP Address field underneath IP control.
If you change the Static IP to Require Registration in the IP control drop down menu, the IP address section changes.
Here you have to enter the SIP user that will be used for this SIP trunk.
The domain that requires the registration for the SIP trunk
And the password required to access the SIP Trunk. The trunk will auto generate a password but you can change this if you so desire.
Next is the Dial Plan and Limits tab.
You need to select the Dial Translation and the Dial Permission from the drop down arrows.
The Slider bars for the limits normally stay at unlimited but you can change the value by moving the slider left or right.