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Mandatory Fields SDP includes mandatory fields, which must be included in any session description, and optional fields, which may be omitted The following fields are mandatory:
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v Meaning the protocol version, this field marks the start of a session description and the end of any previous session description When SDP is used as part of a SIP message body, only one SDP description should be present, which means that the v field should appear only once in an SDP-based SIP message body o The session origin or creator and session identifier s Standing for the session name, this is a text string that could be displayed to potential session participants The use of the session name is quite appropriate for a multicast session, but not for a unicast session such as a simple call between two parties Therefore, when SDP is used in a SIP message body, the session name should be just a single space SDP does not permit the s line to be absent, nor does it permit the session name to be empty t This provides the start and stop times for the session Unlike a pre-arranged multicast conference, however, sessions established by SIP are typically established in real time and can be of any duration Consequently, the notion of predefined start and stop times does not apply to a SIP-established session For that reason, an SDP description in a SIP message body should have a t line of the form t 0 0 Strictly speaking, SDP interprets such time values to mean that the session is permanent Such an interpretation does not matter in a SIPestablished session, however, since SIP signaling will be responsible for the setup and teardown of the session, regardless of the time values indicated in the SDP description m This field indicates the media type, the transport port to which the data should be sent, the transport protocol (such RTP), and the media format (typically an RTP payload format) The appearance of this field also marks the boundary between session-level and medialevel information or between different media descriptions
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Optional Fields Of the optional fields in SDP, some apply only at the session level or the media level, while some optional fields can be applied at both In such cases, the value applied at the media level overrides the session-level value for that media instance Thus, if a given field has value X for the session and value Y for media type 1, then value X applies to all media except for media type 1, where value Y applies The following are the optional fields:
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i Representing the session information, this is a text description of the session topic, meant to provide greater detail than the session name This field may be specified both at the session and media levels When SDP is used in a SIP message body, the i field could be included, but would be somewhat superfluous, since SIP already supports the Subject: header field to convey session topic/subject information u This is a URI (such as a web address) where further session information may be obtained For example, a session agenda might be posted on a web page, in which case the URI of the web page would be specified Only one URI may be specified per session Unlike prearranged conferences, SIP sessions are typically established on demand Therefore, one is unlikely to find the u line in an SDP description within a SIP message body e This is the e-mail address of the individual responsible for the session Several instances of this field may exist and would be used if several individuals could be contacted for more information This field applies only at the session level p This is a phone number for the individual responsible for the session As for the e-mail address field, several instances of this field may be included This field applies only at the session level Similar to several of the other optional fields, this field is unlikely to be found in an SDP-based SIP message body c This field provides connection data, including the connection type, network type, and connection address This field can be applied either at the session or media level Although we are listing the c field as optional here, it is more correct to say the field is conditional Because this field defines the network address to which media should be sent, it must be included somewhere in the session description either at the session level or at the media level, or at both If the field appears at the session level, then it is optional at the media level and vice versa b This optional field specifies the bandwidth required in kilobits per second It may be specified at either the session or media level, or both b indicates the bandwidth required either by the whole conference or by a given media type When used at the conference level, it can be considered analogous to a traditional dial-in conference where a maximum number of lines are available r In the case of a regularly scheduled session, this field specifies how often and how many times a session is to be repeated For a SIPinitiated session, this field should not be included
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