Communications system and related method of distributing media

摘要

A communications system and associated method distributes media in a communications network. A Session Initiation Protocol (SIP) communication session call is established between a caller and a communications server. A message is transmitted from the communications server to the media server that includes Session Description Protocol (SDP) parameters for media provided by the media server. Media is delivered to the caller in a packet format in accordance with the Real Time Transport Protocol (RTP) to reuse the same socket as the source IP and port numbers and update RTP timestamps and sequence numbers. The media is transferred to the caller with minimal jitter buffer flushes and network resource usage.

主权项

1. A method of distributing media, comprising:
establishing a Session Initiation Protocol (SIP) communications session call between a caller and a communications server; transmitting from the communications server to a media server a message that comprises Session Description Protocol (SDP) parameters for media to be provided by the media server without renegotiating the session call; delivering the media to the caller in a packet format in accordance with the Real Time Transport Protocol (RTP) and reusing the same network socket as source IP and port numbers and updating any RTP timestamps and sequence numbers; forming a proprietary message to include the SDP parameters for the media provided by the media server, a data field comprising a last sequence number for the RTP packet, a data field comprising a last timestamp for the RTP packet, a data field comprising a real time and last time as to when the RTP packet was sent, and a data field comprising a version and message type for the RTP packet; and transmitting the proprietary message to the media server.