The iPerTalk system is a system that plugs into a company or home LAN network, and can be interfaced with VOIP (Voice Over IP over LAN) lines, or via appropriate gateways with PSTN or ISDN telephone lines. An AGORA’ URMET PABX system is a classic, analogue switchboard that’s not connected to any LAN network, does not have the possibility of interfacing with VOIP lines, and connects via the telephone (white-red) twisted pair cabling.