Methods for Enhancing the Scalability of IMS in VoIP Service Deployment lower the number of messages transmitted between functions of an IMS network. The fuel system also includes a pump that is disposed proximate the fuel tank and operatively connected to the volume. The gate insulator has a thick film portion thicker than a part above the channel region in the gate-length direction at least in a part where the gate insulator is in contact with the boundary surface of the body layer at the end in the gate-width direction. Lever plates of the lever are so configured that protecting edge portions formed on parts of side edges of the lever plates are located substantially at the same position as or behind a projecting end part of the slider when the slider is at the initial position. The movable member acts on the outlet member to deform the plurality of finger projections towards each other to alter an effective cross-sectional area of at least a portion of a dispensing path to control fluid flow along the dispensing path and thereby cause the sprayable material to be dispensed in the desired spray pattern.