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You are here: Home » Session Initiation Protocol or SIP

By Abhishek Ghosh May 22, 2013 7:22 am Updated on May 22, 2013

Session Initiation Protocol or SIP

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Session Initiation Protocol or SIP is a network protocol for setting up, controlling and terminating a communication session between two or more participants. Previously we published What is SIP Trunking -?SIP Trunking is based on Session Initiation Protocol (SIP). The protocol inter alia is in the RFC 3261 specification. In the IP telephony, Session Initiation Protocol or SIP?is a commonly used protocol. Unlike H.323, Session Initiation Protocol or SIP?is developed by IETF. H.323 can be greatly simplified as ISDN over IP. While this allowed particular PBX manufacturers, relatively quick and easy to switch the communication on IP networks, but on the other hand, the strengths and weaknesses of IP networks have not been considered enough. This is particularly apparent in connection with NAT, firewalls and especially in the retail networks (e.g. DSL routers ) – the necessary translation of network addresses, which can be achieved in H.323 only with much effort. Practical parameters like pricing, plans etc. of SIP Trunking services can be seen on any standard SIP Trunking service provider’s websites.

 

Basics on?Session Initiation Protocol or SIP

 

Session Initiation Protocol or SIP, however is much better suited for IP networks. The structure of SIP allows to easily add new extensions without that all involved devices. Also, it is more general – While H.323 only intended for telephony, with SIP sessions of any kind can be managed. The main application is found in the audio and video transmission, some online games use to manage the transmission. An internet phone call to lead to you need more than just more, because SIP negotiate the communication modalities – the actual data for the communication need of others, for appropriate protocols to be replaced. For this purpose SIP is widely used.

The separation of both session and media streaming can be encrypted independently. You can use SIP over the TLS protocol, also known as SIPS and encrypt the streaming (voice data). Any combination thereof is possible. Purpose of a secure encryption has importance in data streams (i.e. meeting and media) which must be encrypted. The symmetric keys are exchanged via the streaming media SDP (i.e. SIP) and would thus may vulnerable over an unencrypted SIP. The symmetric keys of TLS are exchanged at the beginning of the session.

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Session Initiation Protocol or SIP : Network elements

 

User Agent : The user agent is an interface to the user, showing the contents and taking orders. Even a SIP phone is a SIP user agent that provides the traditional call functions of a telephone, such as Dial, Answer, Reject and holding.

Proxy : A proxy server is a communication interface in a network. It works as an agent (routing) which accepts requests on the one side, and then connects to another side of his own address. Its task is to ensure that requests are sent specifically to the user. Proxies are also necessary for the enforcement of the hierarchy.

Session Initiation Protocol or SIP

Registrar server : The registrar server acts as a central point in the system architecture of SIP. It will take over the registration of requests for the domain it handles. It can edit one or more IP addresses to a specific SIP URI, which are transmitted by the SIP protocol.

Redirection Server/Redirect Server : The redirection server relieves the proxy server. It passes the routing information directly to the user agent client. It generates the redirects the incoming requests to an alternate set of URI. The redirect server allows SIP session invitations to external domains to communicate.

Session Border Controller : A Session Border Controller is a network component for safe coupling of computer networks with different security requirements. It serves as a medium between nodes and SIP user agent server for different types of features, including support for Network Address Translation (NAT) Gateway A gateway can be a SIP network to other networks, such as for example, connect to the public telephone network that uses different protocols and technologies or can act as an interface.

 

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Orthopaedic Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Session Initiation Protocol or SIP," in The Customize Windows, May 22, 2013, February 27, 2021, https://thecustomizewindows.com/2013/05/session-initiation-protocol-or-sip/.

Source:The Customize Windows, JiMA.in

 

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