IETF RFC – Replaces RFC • “The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating. PDF | Many styles of multimedia conferencing are likely to co-exist on the Internet , and many of RFC SIP: Session Initiation Protocol. Illustration, which can be viewed like a slideshow, of the Registration and Session establishment examples given in RFC - 1 of 16 (sequence chart).
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[Docs] [txt|pdf] [draft-ietf-sip- ] [Tracker] [Diff1] [Diff2] [IPR] [Errata] Updated by: , , , , , , PROPOSED STANDARD , , RFC SIP: Session Initiation Protocol, June Canonical URL: https:// tvnovellas.info; File formats: Plain Text PDF; Status: PROPOSED. Internet telephony use a verity of signaling protocols, such as H, SIP, MGCP and H (MEGACO) for initiating VoIP call. However, SIP seems to.
The implementation of these applications is complicated by the practices of participants: users may move between endpoints, they may be addressable by multiple names, and they may communicate in several different media - sometimes simultaneously. Numerous protocols have been authored that carry various forms of real-time multimedia session data such as voice, video, or text messages. For locating prospective session participants, and for other functions, SIP enables the creation of an infrastructure of network hosts called proxy servers to which user agents can send registrations, invitations to sessions, and other requests. SIP is an agile, general-purpose tool for creating, modifying, and terminating sessions that works independently of underlying transport protocols and without dependency on the type of session that is being established. SIP can also invite participants to already existing sessions, such as multicast conferences.
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No Trade Secrets. Microsoft does not claim any trade secret rights in this documentation. Microsoft has patents that might cover your implementations of the technologies described in the Open Specifications documentation. The first line of a request has a method , defining the nature of the request, and a Request-URI, indicating where the request should be sent.
Requests initiate a functionality of the protocol. They are sent by a user agent client to the server, and are answered with one or more SIP responses , which return a result code of the transaction, and generally indicate the success, failure, or other state of the transaction. Responses are sent by the user agent server indicating the result of a received request. Several classes of responses are recognized, determined by the numerical range of result codes: SIP defines a transaction mechanism to control the exchanges between participants and deliver messages reliably.
A transaction is a state of a session, which is controlled by various timers. Client transactions send requests and server transactions respond to those requests with one or more responses.
The responses may include provisional responses with a response code in the form 1xx , and one or multiple final responses 2xx — 6xx.
Transactions are further categorized as either type Invite or type Non-Invite. Invite transactions differ in that they can establish a long-running conversation, referred to as a dialog in SIP, and so include an acknowledgment ACK of any non-failing final response, e.
When developing SIP software or deploying a new SIP infrastructure, it is very important to test capability of servers and IP networks to handle certain call load: The service provides routing of telephone calls from a client's private branch exchange PBX telephone system to the public switched telephone network PSTN.
SIP trunking is a similar marketing term preferred for when the service is used to simplify a telecom infrastructure by sharing the carrier access circuit for voice, data, and Internet traffic while removing the need for Primary Rate Interface PRI circuits. SIP-enabled video surveillance cameras can initiate calls to alert the operator of events, such as motion of objects in a protected area. SIP is used in audio over IP for broadcasting applications where it provides an interoperable means for audio interfaces from different manufacturers to make connections with one another.
The U. The implementation can work in proxy server or user agent scenarios and has been used in numerous commercial and research projects. Numerous other commercial and open-source SIP implementations exist. See List of SIP software. Services using SIP-I include voice, video telephony, fax and data.
This preserves all of the detail available in the ISUP header, which is important as there are many country-specific variants of ISUP that have been implemented over the last 30 years, and it is not always possible to express all of the same detail using a native SIP message. Concerns about the security of calls via the public Internet have been addressed by encryption of the SIP protocol for secure transmission. The last hop from the proxy of the target domain to the user agent has to be secured according to local policies.
TLS protects against attackers who try to listen on the signaling link but it does not provide end-to-end security to prevent espionage and law enforcement interception, as the encryption is only hop-by-hop and every single intermediate proxy has to be trusted.
End-to-end security may also be achieved with secure tunneling and IPsec , but most service providers that offer secure connections use TLS for securing signaling. From Wikipedia, the free encyclopedia. Main article: List of SIP response codes. Network World. May 11, Understanding the Session Initiation Protocol Second ed. Artech House. Internet Engineering Task Force.
Retrieved Session Initiation Protocol.
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Transactions on Emerging Telecommunications Technologies. Handbook of algorithms for wireless networking and mobile computing. CRC Press. Practical VoIP Security.
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