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Structure of the SIP Protocol
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In this case it would be important to be able to pass along your private user identity for proper billing of the call. However, the identity must be protected from discovery by intermediate networks, so tunneling and other methods may be used. Since the private user identity is not known by subscribers themselves, there must be a means of embedding the identity into a subscriber s device. This is commonly done today in GSM networks using the Universal Integrated Circuit Card (UICC). This is the little card inserted into the GSM phone when you obtain service from a GSM service provider. We commonly refer to this little card as the Subscriber Identity Module (SIM); however, the SIM is actually the name of the application that resides on the UICC. The SIM provides the private user identity for the GSM service provider, and as SIP is implemented in these networks going forward, the device will continue to provide this identity in the SIP domain. This also applies to fixed-line services, where the subscriber will purchase a device and insert the SIM into the phone when that subscriber obtains services from the service provider. This model allows subscribers to use any device they want, while uniquely identifying them to the service provider. The service provider is then able to associate the user with an authorized subscription, even though that user may be using a device he or she purchased from someplace else. There is other information stored on the SIM application in addition to the private user identity, as we will discuss. In a perfect world, subscribers purchase a SIM application contained on a UICC from their local service provider of choice, and then use this in the various devices they purchase from the Internet, from their local electronics store, or from other service providers. The revenue stream comes from the purchase of a subscription rather than a device locked to work on the service provider network only.
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Public User Identity
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The public user identity is what subscribers use to advertise their existence. We all have one today, although ten years ago only a select group carried one. On the other hand, one could argue that we have all had a public user identity in a different form for decades: our telephone number. The public user identity uses the same NAI form described for the private user identity, with the exception of the content, which would not consist of the IMSI (in the wireless case). The public user identity is not limited per subscriber as the private user identity is. A subscriber is likely to have multiple public user identities associated with one subscription, allowing that subscriber to use different devices for different purposes, using the same service provider (and on the same bill). This means that every subscriber has the potential of multiple public identities to then use for personal use, business use, maybe a special hobby, or anything else he or she chooses. If you use AOL today, you will find a similar concept, where you have a primary screen name (your public user identity) but on the same account you can have multiple screen names, all billed to the same account. Each of the public user identities will have a profile identifying the various preferences defined by the subscriber, and identifying what services are associated with the identity.
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For example, I may choose to have my Blackberry service associated with my business identity, but a separate cell phone service with text and instant messaging for personal use, associated with my personal identity. This allows the service provider to offer a lot of flexibility for its subscribers, and eliminates the need for multiple accounts for each identity. This also allows for flexible routing to the subscribers various devices. For example, I can have calls to my business number routed directly to my Blackberry, and if there is no answer (or my Blackberry is out of range), I can have the call routed to my voicemail. On the other hand, if my spouse calls my business number and I do not answer, I can request special routing for her call (based on her identity) so that she is routed to my personal phone rather than voicemail. The subscriber then has complete control over call treatment for each one of his or her identities. The public user identity is used for routing, which is different than the private user identity as we discussed previously. However, the public user identity is not used for authentication. Only the private user identity can be used for authentication. Authentication is an optional function in SIP networks, unless the network is following the 3GPP IMS implementation standards. In the IMS, authentication is required anytime a subscriber accesses the network and registers his or her location. When a subscriber activates a device and accesses the network, that subscriber s private user identity is sent along with his or her public user identity of choice (usually assigned to the device or through a login GUI on their PC) in a REGISTER message. This is how subscribers notify the network of their location. The REGISTER message is not the same as authentication. Registering does nothing more than notify the network of the location for the specified identity. Authentication requires the exchange of credentials between the device and the network. We will talk about authentication in 4.
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Session Description Protocol (SDP)
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The Multiparty Multimedia Session Control (MMUSIC) working group of the Internet Engineering Task Force (IETF) defined a protocol to be used in SIP networks for the announcement, description, and control of a conference utilizing multiple media types and multiple parties. A good example of such a session is a Webinar, where many parties are invited to participate in a conference utilizing text documents, PowerPoint presentations, video, audio, and other forms of media. For this to work, there must be some form of communications to all parties regarding the type of session, the media types that must be supported to participate, and other logistical information that may be of interest to the participant. Certainly when you examine the contents of the SDP, you will see these elements are provided as a main function of the protocol. The SDP was not originally intended for use with just SIP. In fact, SDP can be used with most any protocol including the Realtime Transport Protocol (RTP), the Hypertext Transport Protocol (HTTP), and the Simple Mail Transport Protocol (SMTP). It has been adopted for use with SIP to describe a SIP session within a SIP network, and it is defined throughout the 3GPP specifications for an IMS framework as the session description protocol for all SIP sessions.
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