OvisLink call center headset product line has USB (mono and stereo) for computers, 2.5mm and RJ22 for different phone brands included: Nortal Meridian, Aastra, ShoreTel, Panasonic, Cisco, Polycom, Grandstream, Linksys, Snom... Call Center Headset for Grandstream and Panasonic $56.95 Headset for Nortel Meridian, Norstar, NEC Avaya, Aastra, Altigen, PolyCom & ShoreTel Plantronics T20 Headset Telephone $56.95 2.5mm Call Center Headset for Grandstream & Linksys $56.95 Call Center Headset for Cisco Grandstream GXP2000 & BudgeTone $56.95 USB Call Center Headset (Mono) $69.95 USB Call Center Headset Stereo $79.95 Grandstream GXP2010 & Professional Headset Listing price: $181.95 On Sale $169.95