VoIP Gateway: "A network device that converts voice and fax calls, in real time, between the public switched telephone network (PSTN) and an IP network. The primary functions of a VoIP gateway include voice and fax compression/decompression, packetization, call routing, and control signaling. Additional features may include interfaces to external controllers, such as Gatekeepers or Softswitches, billing systems, and network management systems. " (<a href="http://isp.webopedia.com/TERM/V/VoIP_Gateway.html">source</a>)

VoIP Gateway: "A network device that converts voice and fax calls, in real time, between the public switched telephone network (PSTN) and an IP network. The primary functions of a VoIP gateway include voice and fax compression/decompression, packetization, call routing, and control signaling. Additional features may include interfaces to external controllers, such as Gatekeepers or Softswitches, billing systems, and network management systems. " (<a href="http://isp.webopedia.com/TERM/V/VoIP_Gateway.html">source</a>)