It is important to note, always use the IP address of the system, never use 127.0.0.1. 

3CX 12?

If you are using 3CX version 12 then you will need to install our template files. Follow the steps below. 

• Download the NBE 3CX template files here

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• Extract the contents of the ZIP file to the correct location for your version of Windows.

For Windows XP/2003:
C:\Documents and Settings\All Users\Application Data\3CX\Data\Http\Templates\gateway

For Windows Vista/7/2008
C:\ProgramData\3CX\Data\Http\Templates\gateway