Possible Clues:

• Loudhailer
• Huge mobile amplifier
• Sound director gives Margaret a ring
• Voice-amplifying device
• Sound booster
• That'll make it sound a lot to give Margaret a ring, but not for her finger
• Having plan to ring say, husband, one acquired hearing aid
• Give Margaret a ring - or a shout with this
• Extremely large ring on loudhailer
• It gives speaker a boost having name included in redesigned home page