The Sipura SPA-3000 is labeled as a 1 Port FXS + 1 FXO Analog Telephone Adapter. Just what that means to non-telephony guru's is anybody's guess. What it does mean is that the SPA-3000 has both a PSTN (Public Switched Telephone Network) port for plugging in a standard analog telephone line as well as a POTS (Plain Old Telephone Service) jack for plugging in a standard analog telephone. Along with the two telephony jacks, the SPA-3000 is fitted with an RJ45 plug for connecting to your Ethernet network..



Link: Geekgazette