... used to describe the audio path. In IP networks, it is common and normal for packet loss to occur. In fact, Transmission Control Protocol/Internet Protocol (TCP /IP) was built to utilize packet ... Datagram Protocol (UDP) /IP header to provide timestamping . RTP runs atop UDP and IP and is commonly noted as RTP/UDP /IP. RTP is currently the cornerstone for carrying real-time traffic across IP networks. ... call-control protocol. VoIP Call-Control Protocols As of this writing, the main VoIP call-control protocols are H.323, Simple Gateway Control Protocol (SGCP), Internet Protocol Device Control (IPDC),...