uni Directional RTP. enables one sided RTP stream - according to niDirectionalRTPMode. enables the User to set the channel to work with unidirectional RTP streams. When UniDirectionalRTP is set to acRTPTxOnly, the receiver part of the channel will be disabled, and only the transmitter (encoder) will work. When UniDirectionalRTP is set to acRTPRxOnly, the transmitter part of the channel will be disabled, and only the receiver (decoder) will work. When UniDirectionalRTP is set to acRTPTxRx, both sides will be enabled. Users should note that when configuring a session between two endpoints, some of the channel configuration parameters must be identical on both sides. Such parameters are the voice coder type, the Fax/Modem transport type and bypass coders. All other configuration parameters are independent.