mobile user part (mobile communications) (MUP)

The Mobile User Parts (MUP) belong to the SS7 signaling and are used in GSM networks.

The User Parts( UP) are entered in the data field for the service indicator, the Service Indicator( SI). The SI data field is a 4-bit long data field in the Message Transfer Part( MTP) of the Message Signal Unit( MSU). The Mobile User Parts are used to exchange signaling messages for the establishment and termination of the user channel connection.

Less commonly used is the term Mobile User Part (MUP) for the mobile device, the cell phone.