When the CommuniGate Pro Server software is installed, it automatically creates a PBX Center Account pbx in the Main Domain, and it creates the 200, and conference Aliases for that Account.
Remote VoIP users can access the PBX Center by calling sip:email@example.com, and users with Accounts in your Domain can access your PBX Center by dialing 200 on their VoIP phones.
If your Domain uses PSTN gateway(s) for incoming calls, you may want to configure those gateways to direct all incoming calls to your PBX Center Account.
You can also use the PBX Center Account address as the "public VoIP address" of your organization.
If you are a Server or a Domain Administrator and you want to create an alternative PBX Center: