We receive lots of questions on sales asking what this product it:

VoipNow extension level SIP Trunking support

Most people find it in the online store and they do not have any clue about it. As you might have learned we will soon release VoipNow Core, the 4Grid solution for delivering SIP trunking, wholesale, media gateway services. VoipNow Professional has never been designed with SIP trunking capabilities, even if we have customers that use it for such services.

The above VoipNow Professional addon does a very simple thing. When enabled on an extension level, you can connect a PBX to that extension (when a DID assigned on that extension is called, it is passed further to the PBX in SIP:To). We added this option because some customers wanted to connect PBX to VoipNow Professional. But if you are serious about SIP trunking, you should implement VoipNow Core.