(1) (
Message
Transfer
Part) See
SS7.
(2) (
Media
Transfer
Protocol) A Microsoft enhancement to the Picture Transfer Protocol (PTP), starting with Windows Media Player 10 in Windows XP. While PTP deals with photos, MTP also supports the transfer of music files and metadata, such as titles and artist names, between portable players, Android phones and the computer. See
PictBridge and
USB device class.