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I. background and functions of the SIP protocolSIP (Session Initiation Protocol) is developed to help provide advanced telephone services that span the internet. Internet telephone IP telephone) is evolving to a formal business telephone model, and SIP is an important member of the series of protocols to ensure the implementation of this evolution.SIP is part of the IETF standard process. It is built based
Sip nat/FW Default font9pt10pt11pt12pt13pt14pt15pt16pt17pt18pt20pt25pt30pt35pt40pt45pt50pt Basic Principles of NAT and FirewallFirst, there are several Nat methods: Full Cone: when a private network host sends a packet to the public network, its local address and port are {A: B}, Nat will set its private address {: b} convert to public address {X: y} and bind it. Any package can be sent to the host's {A: B} address through the address {X: y}. Nat w
The original link (also reproduced) http://blog.csdn.net/yetyongjin/article/details/6881491. I have modified some typos. SIPWhat kind of problems do you encounter from the private network to the public network? 1. Address translation of the package.2. SIP address translation inside SIP messages.3. The RTP address translation in the SDP in the SIP message.The exis
The previous article briefly analyzes the imsdroid project. This article continues the previous article. Continue to analyze the IMS Private Identity (IMPI) Identity authentication user id for example: banketreeIMS Public Identity (IMPU) Public authentication such as: sip: 33446677887@doubango.org service settings: [java] // Sets IP address final String proxyHost = "192.168.0.1"; mConfigurationService (ConfigurationEntry. NETWORK_PCSCF_HOST, proxyHost
In the process of establishing a session, we must apply it to the SIP protocol. Some friends may not understand this agreement. It doesn't matter. Here we will explain the content of this Protocol. You may be familiar with the SIP protocol. The Session Initialization Protocol is an application layer control protocol. So what are more specific functions and applications? It can be used to create, modify, or
Document directory Registering multiple user devices The via header, forking, loop prevention An example using proxies User location Let's step out of the SIP layers and see what we have so far: using the layers, we can now create and receive sip transactions. One basic requirement in SIP is for phone devices to be able to register their location with a regi
Transferred from: blog.csdn.net/boy8239/article/details/1799542Author: boy8239 has already introduced sip-related knowledge about important SIP header domains, registration processes, and session processes. Now let's introduce the Routing Mechanism in SIP. In general, there are two routing scenarios in SIP: 1. Request
Address: http://www.linphone.org/eng/documentation/guide/ What is sip? (What is Sip) SIP is a protocol for establishing voice over ip cils. it is an open standard, published by the IETF organization, who made the vast majority of Internet protocols. it is too red from e-mail and HTTP. the following section describes the base principlesSIP from the user's standpoi
This article, the original connection: http://blog.csdn.net/freewebsys/article/details/46546205, reprint please indicate the source!1, about FreeSWITCHFreeSWITCH is a soft-switching solution for telephony, including a softphone and soft switch to provide voice and chat product drivers. The FreeSWITCH can be used as a switch engine, PBX, multimedia gateway, and multimedia server.FreeSWITCH supports a variety of communication technology standards, including SI
I'm afraid you know more about the Unified Communication Protocol. If you are not clear about it, don't worry. Next, Let's explain the content. How does the SIP Protocol promote unified communication? Next, let's take a look at some of the characteristics of the SIP protocol. Let's see how it provides support in this regard. Support for the SIP protocol in Unifie
With the development of the network, VoIP services and unified communication platforms become more and more important. The SIP protocol is an exciting focus. Some may ask, what is the SIP protocol? What's better about it? Here we will go into more details. The Chinese meaning of the SIP protocol is the process initialization protocol. The existence of the
Today the work encountered two devices between the SIP packet crawl and analysis, and then combined with the RFC3261 document description, recorded today understand.1.SIP Protocol:Detailed RFC documentation for SIP is visible: rfc3261Session initiation, which allows you to use Internet endpoints (user agents) to find participants and allow you to create a shareab
Today, I encountered the capture and analysis of the SIP packets between the two devices. Then, combined with the instructions in rfc3261 documents, I recorded what I understood today. 1. SIP protocol:The detailed RFC documentation for SIP can be found at: rfc3261Session Initiation (Session Initiation Protocol) allows the use of internet endpoints (User proxies
I believe that you have mastered the basics of IMS and SIP protocols and some precautions. These contents are also described in two articles, "briefly describing the SIP protocol in IMS" and "Problems Existing in IMS and SIP. Next we will explain the SIP Protocol extensions in IMS. 1.
Chapter 7 Registration Section 1 Overview SIP provides a capability to discover users. If a user wants to enable a session with another user, the SIP must be able to discover the current host of the target user. This discovery process is often used by SIP network elements, such as proxy servers or redirection servers. These servers can receive a request and detec
Introduction 1. About the SIP protocol Currently, there are three basic communication protocols based on VOIP: H 323, SIP, and MGCP. The following describes the comparison between the H 323 protocol and the SIP protocol. H.323 was proposed by ITU. It attempts to regard IP phones as well-known traditional phones, but the transmission mode is changed from circuit s
Create a list If you are developing an application using the sip api, remember that this function is only supported in Versions later than Android (API level 9. In addition, not all devices running Versions later than Android (API level 9) provide SIP support. Add the following permissions to your application list to use the SIP 1. Android. Permission. use_sip 2.
The use of the SIP protocol is not uncommon. With the popularity of the VoIP service, we also have a better understanding of the SIP protocol. Here we will focus on the advantages of SIP. In this case, we need to compare this advantage with other protocols. Advantages of SIP: Service providers can select standard compo
We also talked about the SIP Protocol and related SIP protocol stack. In this paper, we propose a software structure and design implementation scheme of the software telephone based on the SIP protocol. this solution is based on the embedded Windows CE platform. The middleware uses the Open-Source SIP protocol stack oS
SIP is an application control signaling protocol proposed by IETF. As the name implies, it is used to initiate a session. It can be used to create, modify, and end multimedia session processes attended by multiple participants. Participants can communicate with each other through multicast, unicast, or network connection.There are clients and servers in the SIP. A client is an application that establishes a
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