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SIP describes a series of protocols to establish the connection and transmission of media streams, including voice, over IP networks. It includes definitions for the Session Initiation Protocol, session reservation protocol (SAP) and Session Description Protocol (SDP). SIP supports a flexible way of addressing the terminals. The recipient can be represented by an email address, an URL or a phone number in ITU-T E.164 format. The protocol is a request-response type with syntax and semantics similar to the HTTP protocol used on the World Wide Web.
As the name suggests, SIP is used to initiate sessions between users, but in a very simple manner. This is because SIP creates a service location, terminal management and stability of the connections, but not resource reservation for circuits or tunnels used in the transmission of information. These features make it like H.225 protocol. SAP is used with SDP for describing user sessions using UDP packets. SIP messages of request-response type include an INVITE request followed by a response indicating the results. For example, a 200 OK response type means that the connection request has been accepted. The request header contains information that summarizes the call details. After the header there is the content of the message, which contains a description of the session that is intended to be created.
If you ask yourself why you should choose DoubleHorn, just take a look at our website and browse through the information we put at your disposal. We try to explain everything in a simple manner so that you know the advantages you will have after choosing us, such as the VoIP Discount. Moreover, if you have any question, don’t hesitate to contact us! Write us now and we will answer promptly. We offer you all the communications needs you may want: from Broadband Internet to Voice, Mobile, E-mail and Website Hosting.
If you want to find out more about the company, read the section with Team Members. We even have a blog where further information is available. . Or you can read the testimonials of some of our clients. You can count on our services, our punctuality and our customer support anytime you want to get to the next level. We seek high performance and we strive to offer you security and reliability.
Are you curious about what differentiates us from others? Just think a moment: are you paying separately for your phone service and for the Internet? With us, you have anything you can need in terms of communications: a full-featured phone system, dedicated broadband access and unlimited calling. Just considering these and you will get a major VoIP Discount.
Benefit from the VoIP Discount https://www.doublehorn.com/voip-discount by choosing DoubleHorn Communications as the company to help you with your communication means! And find out all about the benefits of using SIP https://www.doublehorn.com/sip .