Yealink Enterprise HD IP Phone - Business VoIP Phone with High-Definition Audio, Call Forwarding & 3-Way Conferencing - Ideal for Office, Call Center & Remote Work

The SIP-T21P seems to work well connected to an updated Freeswitch 1.6.9 server after Rport was enabled on the Account-->Advanced web setup page for the phone. The phone does require a POE power supply to operate, I am using an Intellinet 524179, but there are many others available. The voicemail light seems to work properly when used with Freeswitch (FusionPBX 4.2.0 interface).