The CISCO (or even Netgear) SPA-3102 was a Voice Gateway device, used to convert between the POTS (Plain Old Telephone System) and a VOIP server. The device is very much end-of-life, and although not sold new, is widely available and still very popular. There are many online guides for using the SPA-3102, but since it can be used in many countries and with many different platforms, it can be quite different to get working. Even with a UK guide,...