First, download the software and follow the onscreen instructions to install the software.
Voicent software can use several phone services: VOIP phone service (such as SkypeConnect, Vonage Softphone, Callcentric, any SIP trunk provider, etc), PBX system with SIP extensions (like Cisco, Avaya, Asterisk, etc), or traditional analog phone service.
For testing purpose, it is easier to configure the software to use a VOIP service or PBX's SIP extension. For more details, please see Quick Start Guide, which also comes with the installation package. If you have the enterprise edition, please take a look at Enterprise Edition Setup Guide also.
Open Voicent Gateway, select Setup > Options > Inbound Tab, then uncheck the box labeled "Do not pickup incoming calls".
Restart the gateway and call the number that the gateway is configured to use.
The gateway should answer the call and play a short welcome prompt, and disconnect.
So far, there is no PBX application installed on the gateway. To have Flex PBX application installed, please take a look at this PBX example.