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Structure of the SIP Protocol
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The strength of SDP is its ability to describe a wide range of session media types. This is perhaps the reason the 3GPP has defined its use for IMS. The IMS certainly supports all media types using the SIP protocol for all session control. The Session Description Protocol (SDP) is carried within the SIP message body itself. The SDP is what describes the session being set up by SIP. Note that not all SIP messages will contain SDP. For example, SIP messages are used to carry the content of instant messaging or Short Message Service (SMS) messages. The content of these are found in the message body of SIP, rather than in a separate packet sent through another stream (as is the case for voice and video). The message body therefore can contain SDP describing a session found on another stream, or it can carry actual content, in which case SDP is not needed. SDP is only needed when setting up a session that will contain voice or video, or some other form of real-time content to be found on a different path. This is analogous with Signaling System #7 (SS7), which is used in legacy networks today to set up voice calls on trunks. The actual signaling messages are carried over the same facilities separated by channels, and the SS7 message provides the details of the session being established on the voice or video channels. The SDP protocol is actually quite simple. The headers consist of a single letter, followed by a descriptor. The descriptor is what identifies the specifications for the actual session itself. There are several descriptions provided by the SDP identifying the name of the session, the purpose of the session, the time the session starts, what media are used for the session, and any addresses and ports to be used to receive the media. In the case of multimedia calls, SDP can describe all of the media sessions, even though they are all treated separately. For example in a Webinar session, there will be audio, voice, a whiteboard session, possibly a presentation application (such as PowerPoint), a notes application (plain text communications), a console function (identifying all of the participants and granting control over those participants to the host), and maybe even more. Each of these media types can be described in one SIP message using the SDP to describe the various media sessions individually. Since each media type requires different parameters, the protocol must treat each one individually. In this case, the SDP describes the overall session using the session-level description, but it then uses the media descriptions to describe each individual media session. This means that within the SDP, there might be one session description, followed by multiple media descriptions. Each of the media descriptions describes a portion of the overall session. SDP can also contain information about the host of the session, such as contact information and bandwidth requirements for receiving the session. SDP is therefore broken into three main descriptors:
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Session-level descriptions Time descriptions Media descriptions
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Session Descriptions
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The session-level descriptions provide details about the session itself, such as the host of the session and the address for the session. There could be more than one session description within a single SIP message. In other words, one SIP INVITE could carry within itself SDP descriptors for more than one session. This is so when supporting a conference call, as an example; where there is need for multiple media types, each media type can be described separately. The session descriptors in this case will always be followed by their respective time descriptions and media descriptions. Following are the headers for the session-level descriptions in SDP:
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v = protocol version Identifies the version of SDP being supported for this session. This is used so that the receiving entity knows how to interpret the other attribute lines within the SDP. o = owner/creator and session identifier Identifies who is initiating the session as well as identifying the session itself. Its use may not seem logical for a simple voice session between two parties, but it makes more sense when the session is a conference call or Webex session. The format for this field is shown here:
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