Running Head: IS-3120_UNIT-7_ASSIGMENT-7 Solving a Business Challenger Using SIP Technology Jose A. Torres IS-3120 Prof. C. Rollins 02/23/2014
Running Head: IS-3120_UNIT-7_ASSIGMENT-7 Which SIP-based technology(s) will meet Fifth Main Bank’s goals? SIP - Session Initiation Protocol - is a network communications protocol commonly employed for Voice over IP (VoIP) signaling. In VoIP networking, SIP is an alternative approach to signaling using the H.323 protocol standards. SIP is designed to support the calling features of traditional telephone systems. However, unlike the traditional SS7 technology for telephone signaling, SIP is a peer-to-peer protocol. SIP is also a general-purpose protocol for multimedia communications not limited to voice applications. What are at least three networking and technological concern for implementing this solut ion? •H.323 Is a protocol standard for multimedia communications. H.323 was designed to support real-time transfer of audio and video data over packet networks like IP. The standard involves several different protocols covering specific aspects of Internet telephony. The International Telecommunication Union (ITU-T) maintains H.323 and these related standards. Most voice over IP (VoIP) applications utilize H.323. H.323 supports call setup, teardown and forwarding/transfer. Architectural elements of a H.323 based system are Terminals, Multipoint Control Units (MCUs), Gateways, an optional Gatekeeper and Border Elements. Different functions of H.323 run over either TCP or UDP. Overall, H.323 competes with the newer Session Initialization Protocol (SIP), another proven standard often found in VoIP systems.
Running Head: IS-3120_UNIT-7_ASSIGMENT-7 •SS7
Supports the exchange of special-purpose messages on public telephone networks. For example, using SS7, telephone companies can implement modern consumer telephone services such as call forwarding. SS7 messages pass over a separate channel than that used for voice communication. This technique is commonly referred to as "out of band" signaling. Out-of-band communication techniques like those in SS7 are commonly utilized in computer networking. The File Transfer Protocol (FTP), for example, communicates out-of-band by utilizing two different channels and TCP port numbers, one for data traffic and one for "control" information. •VoIP VoIP is a technology that allows telephone calls to be made over computer networks like the Internet. VoIP converts analog voice signals into digital data packets and supports real-time, two-way transmission of conversations using Internet Protocol (IP). VoIP calls can be made on the Internet using a VoIP service provider and standard computer audio systems. Alternatively, some service providers support VoIP through ordinary telephones that use special adapters to connect to a home computer network. Many VoIP implementations are based on the H.323 technology standard. VoIP offers a substantial cost savings over traditional long distance telephone calls. The main disadvantage of VoIP is a greater potential for dropped calls and degraded voice quality when the underlying network links are under heavy load.
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Running Head: IS-3120_UNIT-7_ASSIGMENT-7 How can the networking and technological concern be overcome? SIP Functions SIP is an enabler-protocol for VoIP and Telephony in general, due to the following features it has: Name Translation and User Location: SIP translates an address to a name and thus reaches the called party at any location. It does a mapping of session description to location, and ensures support for details of the nature of the call. Feature negotiation: Not all communicating parties (which may be more than two) have the necessary features. For example, not everyone may have video support. SIP allows the group the negotiate for the features. Call participant management: SIP allows a participant to make or cancel connections to other users during a call. Users can also be transferred or placed on hold. Call feature changes: SIP allows a user to change a call’s characteristics during the call. For example, as a user, you may want to enable of disable video, especially while a new user joins a session. Media negotiation: This mechanism enables negotiation of the media used in a call, like selecting the appropriate codec for call establishment between various devices. The structure of a SIP message SIP works by having the communicating devices sending and receiving messages. A SIP message carries a lot of information which help identify the session, control timing, and describe the media. Below is a list of what a message briefly contains: •Protocol information (e.g. version) •Session information (creator, name etc.)
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