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Direct Connect Headsets - RJ Plug These headsets Fit 99% of office phones with an RJ9 headset port! Telephones By: 3Com, Aastra, Altigen, Avaya, Comdial, Inter-Tel, Iwatsu, Meridian, Mitel, Nortel, NEC, Norstar, Packet8, Polycom, Shortel, Siemens, Toshiba & More... Cisco Telephone Headsets Headsets for Cisco telephones. Avaya Telephone Headsets Headsets for Avaya telephones. 2.5mm Pin Jack Headsets These headsets Fit 99% of office phones with a 2.5mm headset port! Telephones By: Aastra, At&t, Avaya, BT, Cisco, Ericsson, LG, Linksys, Polycom, Panasonic, Siemens, Spectralink & More... Headset and Amplifier Bundles For telephones without a dedicated headset port.