From VoIP.ms Wiki

PBXes.org Configuration

This article will provide you a guidance when configuring the hosted PBX on PBXes.org website.

This is the initial screen you will see once you have logged in their website.

On the left side menu , click on Trunks > then Add SIP trunk.

Here is where you configure SIP trunk, please take note on the following:

The trunk name can be set as you want.
Username will be the account username/sub account username.
SIP server and domain needs to be filled both with the same server chosen.

It is important to set the dialing rules from the beginning, the basic 1+NXXNXXXXXX will apply to the pattern in the outbound route.

Finally we move to the Outbound Routing in the left menu > Add route > Custom dial pattern > NXXNXXXXXX (basic form).

Please remember that on every change you will not only submit the changes but apply them as well, the site will indicate this.