Speakers, Headsets, Microphones, Receivers, Ringers - Manufacturers, Suppliers Links 

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Plantronics - headsets  http://www.plantronics.com
Jabra - headsets  http://www.jabra.com/index_static.cfm
Primo - microphones, receivers, ringers  http://www.primomic.com
Kingstate - leak tolerant receivers, microphones, ringers  http://www.kingstate.com.tw/p1.htm
Knowles Electronics - hearing aids microphone cartridges  http://www.knowlesinc.com
Bujeon - leak tolerant receivers, microphones, ringers  http://www.bujeon.com
Main Street Technology - leak tolerant receivers, microphones, ringers  http://www.2mainstreet.com