This Visbr headset fit all Small Business phone systems included landline and VoIP systems. Compatible telephone systems included and not limit to: RingCentral, Vonage, JIVE, 8x8, Ooma, Nextiva, Xblue, Panasonic, AT&T, Grandstream, Avaya, Cisco SPA, Mitel, Fortifone, NEC, Nortel, Altigen, ATCOM, Fanvil, Obihai... It will work with all the phones you have in your office. No matter which brand is your business phone system. As long as the phone has a headset jack, you may connect the headset to the headset jack and get it works for you. This headset model has a RJ9 connector and an additional RJ9 to 2.5mm pigtail. If your phone has a 2.5mm headset jack but not a RJ9, connect the 2.5mm pigtail to the headset's RJ9 connector then connect it to the phone. Visbr headsets are premium voice quality headsets for professional call center users. One-Year Warranty Included.