Network Connectivity - Authorization Error On Gateway appliance

When attempting to setup a Gateway appliance SIP connection with a Switchvox appliance, you get the error message: Extensions: Authorization Error. 

1. First, verify that a SIP extension has been created on the Switchvox (a phone does not need to be registered). There must be at least one SIP extension created (go to Setup > Extensions: Manage).

2. If that does not resolve the error, reset the admin password, on both appliances, back to default of admin or modify the password to remove any special characters (i.e., # $ @). On the Gateway go to Configuration > System Administrators to set the admin username and password. On the Switchvox appliance, follow these steps.

3. Make sure the Gateway firmware is up to date (go to Maintenance > Software Updates).

4. Reboot the Gateway if it is still giving the error message.

5. Finally, delete the SIP Endpoints (if they have been created) from Gateway and Switchvox and re-run the Interconnect Utility.