VitalPBX works with any device that uses standard SIP/PJSIP. We don’t focus on specific brands, so you can choose any you desire. We do have our own clients, like the VitalPBX Communicator or VitXi, but you are not obligated to use these.
https://vitalpbx.com/vitxi-webrtc-softphone-client-for-vitalpbx/
