Amazon.com: RJ9 Office HD Voice Headset for Aastra Avaya Allworx AltiGen Digium IPitomy IP Phones, Plus 3.5mm Adapter for Smartphone : Electronics
Aastra 6755i (55i) IP Phone (A1755-0131-10-01) – Atlas Phones
6755i
Aastra 6755i - VoIP-Info
Aastra 6755i IP Phone Headset - EAR-510D
Amazon.com: Professional Dual Ear Call Center Headset Compatible with AASTRA SIP Phones | 2 Speakers on Both Ears, Noise Canceling Microphone & a RJ9 Bottom Quick Disconnect Cord | for Office Users
Certified Aastra Phone Compatible Headsets
AOER 4_pin Call Center Telephone _IP Phone Headset with Adjustable Boom Mic Modular Connector for 3Com Aastra Alcatel_Lucent - Walmart.com