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Registration Procedures in a SIP Network
Throughout the session establishment process, the MGCF/BGCF maintains the dialog with the SIP entities, while also managing the SS7 connection points (the MGCF/ BGCF should also have a SS7 address, or point code). Certainly as the IP network continues to expand and other services begin migration to the IP backbone, the need for switched facilities lessens. This is when operators begin migrating all services to the IP backbone under SIP control. Again this is not an overnight function, but something that takes place over a long period of time (possibly 10 15 years). The STPs in the SS7 network migrate to a call session control function (CSCF) as defined by the 3GPP in their IMS architecture, providing a centralized session control function in the core network, while supporting the same level of authorization and authentication realized now.
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Establishing a Session in SIP
A session in SIP networks can be anything a voice call, e-mail, text message, or video stream. This is the beauty of SIP; network operators are able to use SIP to control all forms of communications within their networks, not just voice. Certainly this is the issue with switched networks today. The technologies and the basic architecture of modern-day networks are not conducive to forms of media other than voice. They were designed and engineered specifically for this purpose. To try to use these same networks for other media types would not be optimal. IP, on the other hand, supports all forms of media. While initially IP brought about its own issues (such as latency and support for real-time media), these have been overcome, and IP is now a great choice for all networks. That doesn t mean IP does not have its issues and challenges. There are still challenges in implementing an all-IP network, or even adding an IP network to a switched network. Still, using IP for a transport has proven to be the best option for supporting today s networks. Early on, many different control protocols were used, a fact that has added to many implementation and interworking issues. The industry has begun settling on one protocol now for session control, and that protocol is SIP. The concept of virtual connections between two entities is not a new concept. You will find many concepts applied in SIP that have existed in many other networks before. SIP is really not all that new, having been derived from the Hypertext Transport Protocol (HTTP) and the Simple Mail Transport Protocol (SMTP). There are two things that need to happen within a SIP network for connections to be established. The first step is to establish a dialog between the entities trying to connect. This allows them to exchange parameters regarding the connection they wish to make. We see a similar concept in existing networks today, where switches communicate the parameters of the connections they wish to make with one another. The difference is in the switched network, the dialog is actually the same as the session description. There is no need to establish a dialog separate from the session, since switched
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networks cannot support multimedia sessions, and therefore there is no need for the switches themselves to exchange information apart from the signaling itself. Another fundamental difference between legacy signaling methods such as SS7 and SIP is that legacy signaling is used to identify a specific resource and what is required to support the voice transmission on that facility. SIP is similar in that it describes what is needed to support the session, but it does not concern itself with the facilities. SIP describes what is needed at the end device supporting the session, including what media types the device is going to have to support. The facility is not described in the SIP dialog. Another fundamental difference is that SIP can support modifications to a session in progress without affecting the session. For example participants can be added or deleted from a session, and media types can be added or deleted as well. This is not possible using signaling such as SS7. In this section we will look at how SIP establishes a session, how sessions are modified and terminated, and how SIP routing works, whether you are using loose or strict routing.
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