Calling from computer to telephone...
GregPhone services based on the VoIP (Voice over IP) technology and SIP protocol. Supported codecs: G711a, G711u, G729a, G726, G723. Customer’s equipment must have SIP protocol supported and connected to GregPhone PBX over internet.
There are many different softohones with that you can use GregPhone network, X-Lite or SJPhone like example.
The only one condition is SIP protocol supported.
After you have installed the softphone into the computer connected to internet, you can setup it to connect to GregPhone network – and then you can make calls and receive calls with headphones and microphone. Of course, it is possible only if your computer is connected to internet.
In this case you don’t need any additional equipment.
More information about connection to GregPhone network you can find here.