IP-enabled PBX (Internet Protocol-enabled Private Branch eXchange) addresses, and are confined to the LAN. Calls between TDM phones also are on a peer-to-peer basis through the TDM switching matrix. Calls between a LAN-attached IP phone and a PBX-attached TDM phone go through the gateway, where protocol issues are resolved, including address translation between PBX extension numbers and Ethernet LAN addresses. See also LAN, IPBX and PBX. |