The Patton SmartNode 4114 gateway will connect an analog PSTN network and 3CX, allowing you to continue to use your existing phone lines until you move to SIP VoIP trunks.
The Patton SmartNode 4114 gateway interoperates very well with the 3CX Phone System. The unit is housed in plastic with LED indicator lights at the front, along with the Console port (which, in a typical installation is not used). On the back side of the unit is the Power jack, the Ethernet jack labeled 10/100 ENET, and four Voice Ports, as shown in the following image.
Note
In our IP PBX consultancy, we've worked with gateways from several different manufacturers: AudioCodes, GrandStream, and Patton. Our experience has been that Patton has delivered the most consistent product and call quality. Also note that AudioCodes is not supported by 3CX. A list of supported gateways can be found at http://www.3cx.com/support/index.html.

We'd like to quickly note several features that can be tricky...