Abstract: There is disclosed an apparatus and methods for adjusting of bit rate transmission in a communication network by monitoring the state of the network, detecting the state of the network and transmitting a multimedia call over the network in accordance with the network state detected. In accordance with the invention the network state is monitored with the bit rate adjusted in accordance with the network state detected. This results in a multimedia call with greatly improved audio quality.

Abstract: A method for communicating between users which employ a plurality of communication devices over a packet switched network. The method includes the steps of receiving a precommunication request for a communication device or devices of said recipient to which said communication should be sent, determining in accordance with a communication receipt preferences of the recipient which communication device or devices should receive said communication and transmitting an indication to the requester to which communication device or devices said communication should be transmitted. The communication itself may be a single media or a multimedia communication.

Abstract: A method and apparatus for reconstructing media at a receiver from a media stream which includes a plurality of data packets wherein each data packet includes at least one media field. The media stream is monitored by a monitoring device and a packet pattern of the media stream is evaluated. An estimating device estimates a media time of at least one lost packet for reconstructing media by a reconstructing device at the receiver.

Abstract: A method for characterizing a dual frequency (DF) signal including the steps of sampling the signal at a sampling frequency vs so as to obtain a sequence of signal samples, and obtaining an &agr;-constant and a &bgr;-constant of the DF signal meeting a predetermined criterion.

Abstract: A method for measuring delay parameters in a packet switched network between node A and node B, each having a clock, is disclosed The method includes the steps of: measuring a first relative one way delay (ROWD1) from node A to node B, measuring a second relative one way delay (ROWD2) from nude B to node A and calculating the difference between the first and second relative one way delays for providing a relative one way delay (ROWD) parameter. Methods for improving TCP protocol and detecting congestion in a packet switched network using ROWD measurements are also provided.

Abstract: A system and method for multi-media half-duplex conferencing in a computer network comprising a plurality of stations and a control server.

Abstract: A system and method for multi-media half-duplex conferencing in a computer network comprising a plurality of stations and a control server.

Abstract: A facsimile gateway provides fax transmission over a packetized network. To accommodate packet delay in the network, an alternate protocol source provides the appropriate notifications to the originating fax machine. In one embodiment, the gateway is constructed using conventional class II or 2.0 fax/modems and voice processing boards. The fax board provides most of the fax gateway operations. As needed, the voice board is switched into the call to provide notifications to prevent a time-out in the originating fax machine.

Abstract: A method for communicating between users which employ a plurality of communication devices over a packet switched network. The method includes the steps of receiving a precommunication request for a communication device or devices of said recipient to which said communication should be sent, determining in accordance with a communication receipt preferences of the recipient which communication device or devices should receive said communication and transmitting an indication to the requester to which communication device or devices said communication should be transmitted. The communication itself may be a single media or a multimedia communication.