FOR OTHER COMPATIBILITY GUIDE
A800SM ASIN # B07DJ7LS4N for Polycom, Mitel and many other phone modles
A800CM ASIN # B07PHSZYW5 for Cisco Phones
If this headset is not compatible with your phones, we recommend use A800YM + Smart Cord (ASIN#B085357113) that features 8-position slide adjustment for compatible most phones. Or reach out us for advice.