sip sdp

Abstract sip, sap, and SDP are important protocols involved in NGN and 3tnet. Based on introduction and analysis of SIP, sap, and SDP protocols, this paper provides a multimedia conference application instance based on the combination of the three protocols. Key words: SIP

RTP/RTCP/RTSP/SIP/SDP RelationshipRTP (real-time transport protocol, Transport layer)Real-time Transport Protocol) is a Transport layer protocol for multimedia traffic on the Internet. The RTP protocol details the standard packet format for transmitting audio and video over the Internet. RTP protocols are commonly used in streaming media systems (with the RTCP protocol), video conferencing and a Push-to-tal

1 Introduction SIPSession Initiation Protocol, Session Initiation Protocol), SAPSession Announcement Protocol, Session notification Protocol), SDPSession Description Protocol, Session Description Protocol) are three sessions) related RFC protocols are connected and differentiated. In this article, we will make a simple analysis of the three protocols and provide a multimedia application that has some practical value to achieve with these three protocols. 2 protocol analysis 2.1 introduction and

RTP/RTCP/RTSP/SIP/SDP relationship1. RTPReal-time Transport Protocol is a Transport layer protocol for multimedia traffic on the Internet. The RTP protocol details the standard packet format for transmitting audio and video over the Internet. RTP protocols are commonly used in streaming media systems (with the RTCP protocol), video conferencing and a Push-to-talk system (with either a/p or

inactive. 11.Even if the offer type is senonly, the answer address and port must exist because RTCP needs to be transferred. 12.If it is RTP, offer uses a specific load number to correspond to a specific encoding. Answer should maintain this relationship. 13.The "M =" Row encoding in answer should be prioritized so that offer can use the highest priority option. Even so, it is recommended that answer take the same priority as offer. 14.Ptime indicates the acceptable packaging interval, but does

streams have a public media format 415 Response ( Media type not supported ) , and join 304 Warning Header field ( Media type not supported ) . 3 . Multicast Operations( 1 ) The multicast addresses that are accepted and sent are the same. ( 2 ) is called not allowed to change the media stream only hair, just accept or receive / To the hair characteristics. ( 3 ) If the call does not support multicasting, the loopback - Response and the Warning ( multicast not available ) . 4 . delayed Media

SDP application in the SIP protocol and SDPSIP Application The SDP is used to construct the message bodies of INVITE, 200OK, and ACK messages for the master and called users to exchange media information. 1. Media Stream Configuration (1) The description of the primary called media must correspond to the nth media stream (m =) of the primary called, and both cont

This page is maintained by Paul E. Jones. Core sip documents RFC 2543 SIP: Session Initiation Protocol (obsolete) RFC 3261 SIP: Session Initiation Protocol SDP Related Documents RFC 2327 Session Description Protocol (

In this super class, we'll talk about the meaning behind the power consumption metrics such as TDP, TBP, SDP, and ACP, first to introduce some basic knowledge: Power consumption calculation of CMOS circuits How does the CMOS circuit consume power? It's a problem to talk about. Integrated circuit power consumption design can be as a subject in-depth study, we also cannot explain in detail CMOS circuit power consumption in what place

on the caller and callee.Session management: includes sending and terminating sessions, modifying session parameters, and activating services.SIP is not a vertically integrated communication system. SIP may be called a part more suitable. It can be used as a part of other IETF protocols to construct a complete multimedia architecture. For example, these architectures will include real-time data transmission protocol (RTP) (RFC 1889) used to transmit

(1) SDP description format(2) SDP example(3) SDP(1) SDP description formatM=video 1234 RTP/AVP 96a=rtpmap:96 H264A=framerate:15C=in IP4 192.168.0.104Above is a self-written RTPM=audio 1234 RTP/AVP 0a=rtpmap:0 PCMA/8000/1A=framerate:25C=in IP4 172.18.168.451.m= is the beginning of a media-level session, Audio: media typ

).Example: Max-forwards:10 CSEQ: A request sequence number that distinguishes between different requests in the same session.Example: Cseq:1 INVITEcseq:4325 BYECseq:1 REGISTER The above 6 header fields are the required header fields in all SIP messages. Contact another SIP URL for direct message routing.Example: Contact:w Riker, acting Captain [email protected]Record-route needs to be on t

with host {x:y}. As shown in the following illustration: symmetric NAT (symmetric type) Symmetric NAT (symmetric NAT) converts the client address {x:y} to the public address {A:B} and binds to {x:y}| {a:b} problems with deploying SIP networks SIP-based voice and video sessions are called Call-in mode (unsolicited incoming calls), the called party can not predict beforehand, so the terminal must always list

programming interfaces (APIS) so that developers can build sip components and applications for service providers and enterprises. Most importantly, more and more competitors are using promising new services to enter the SIP market. SIP is becoming one of the most important protocols since HTTP and SMTP. Advantages of SIP