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( Multimedia Messaging Service)
Multimedia Messaging Service, MMS for short, is a cellular telephone standard for sending messages that include multimedia objects (images, audio, video, rich text). MMS is an extension of the SMS standard, allowing longer message lengths and using WAP to display the content. Its most popular use is sending photographs from camera-equipped handsets, although it is also popular as a method of delivering ringtones as well. The standard is developed by the Open Mobile Alliance (OMA), although during development it was part of the 3GPP and WAP groups. MMS messages are delivered in a fashion almost identical to SMS, but any multimedia content is first encoded and inserted into a text message in a fashion similar to sending a MIME e-mail. MMS defines a subset of MIME content formats in the MMS Message Encapsulation specification. The message is then forwarded to the carrier's MMS store and forward server, the "MMS relay". If the receiver is on another carrier, the relay forwards the message to the recipient's carrier using the Internet. Once it reaches the correct MMS relay for the receiver, the content is extracted and sent to a temporary storage server (often the same process as the relay) with an HTTP front-end. An SMS "control message" containing the URL of the content is then sent to the recipient's handset to trigger the receiver's WAP browser to open and receive the content from the embedded URL. Several other messages are exchanged to indicate status of the delivery attempt.[1] Some installations also include a conversion service that will attempt to modify the multimedia content into a format suitable for the receiver. This is known as "content adaptation", or MMSC.
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