![]() ![]() RTP Payload: This is the media and the amount of data sent is dependent on the codec and sample interval. For instance, this is where G.711, G.729, or H.264 would be indicated. Payload Type: This seven-bit value describes the protocol carried by RTP. Timestamp: The timestamp is used to allow the receiver to play back the packets at the appropriate intervals. However, the sequence number can be used to learn if a packet has been dropped by the network, or arrives out of order. ![]() ![]() UDP) so there are no retransmissions of lost packets. RTP is sent on an unreliable, datagram protocol (e.g. The sender will increment the number by one for each new packet. Sequence Number: The sequence number is used to put an identifying number on each RTP packet sent. The aspects that you need understand are the following: In fact, an RTP header can be as small as 12 bytes. The media streams wouldn’t require transcoding because they are exactly the same. In other words, it’s possible for an H.323 client to communicate with a SIP client as long as you have something in the middle to transcode between the two signaling protocols. One of the cool things about RTP is that it is used by both H.323 and SIP. For the most part, that real-time media will be either voice or video. RTP was developed as a way to deliver real-time media across an IP network. It’s actually a fairly easy RFC to read and comprehend and I invite you to do so, but I think that over the next several paragraphs I can tell you just about everything you really need to know about RTP. Like all IETF protocols, RTP has its own RFC –RFC 3550. RTP stands for Real-Time Protocol and like the bulk of the standards used by and with SIP, it is managed by the Internet Engineering Task Force (IETF). Well, today I’ve decided to do something about that. I’ve written quite a few blogs where I mention that SIP media is sent by something called RTP, but I’ve never described what that means. ![]()
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