SITRAL: an integrated telephony service over a local area network

The authors describe and examine the implementation of SITRAL (Servicio Integrado de Telefonia sobre Red de Area Local), a telephony service over an Ethernet local area network, integrating voice and data and providing both the call control procedures and the packetized voice channels on the nodes of the network for internal calls and access to the public network. The different elements of the voice-data nodes are explained. A brief taxonomy of alternative access methods for the voice packets is presented. A telephony service has been shown to be possible over a standard IEEE 802.3 network. Simulation results show that more than a hundred telephones can use the service simultaneously with a data load of 10%