Các giá trị được gán cho tài sản này cho thấy một vị trí toàn cầu về kinh độ và vĩ độ (theo thứ tự này) Tên sản phẩm múi giờ. Giá trị được gán cho tài sản này chỉ bù đắp từ Coordinated Universal Time (UTC). Trong những ví dụ tương ứng, các khu vực thời gian tương ứng là 28 giờ (thời gian tiêu chuẩn Thái Bình Dương) và 25 giờ (thời gian tiêu chuẩn Đông) Phiên bản. Giá trị được gán cho tài sản này cho biết phiên bản. | 256 Mobile Messaging Technologies and Services Table SDP commands Type Description Status RFC 2327 Status 3GPP Session v Version identifier for the session o Owner creator and session identifier s Session name i Session information o o u URI of description o o e Email address o o p Phone number o o c Connection information b Bandwidth information o z Time zone adjustments o o k Encryption key o o a Session attributes. Pair control range o Time t Time the session is active r Zero or more repeat times o o Media m Media name i Media title o o c Connection information b Bandwidth information o Pair bandwidth information AS k Encryption key o o a Zero or more attribute lines o 1 4-uple control range fmtp rtpmap media server location is usually provided along with corresponding transport ports for content retrieval. Timing information such as start and stop times. A session description in the SDP format consists of a series of text lines in the form type value where type is a one-character type as shown in Table and value is a structured text string whose format depends on its associated type. A session description consists of a session-level description and optionally several media-level descriptions. Note that the presence of the SDP text line starting with type a indicates that there is a need to open an RTSP session. Figure shows the session description included as part of a multipart multimedia message for the streaming of a video content. Charging and Billing The design of charging methods is of key importance for enabling MMS providers to develop billing solutions that meet the requirements of various business models. The 3GPP published Multimedia Messaging Service 257 Figure SDP example a set of specifications describing generic charging principles in and charging principles for MMS in . For billing purposes the MMSC collects charging information when handling messages submission delivery forward and deletion and .
