Phone Features: Voice Mail, Caller ID, Call Waiting, Call Forwarding, Call Transfer, Call Hold, Message Waiting Capability
IP Telephony: Multiple VoIP protocol support, integrated Ethernet switch
Display: LCD display – monochrome
Miscellaneous: Headset jack / RJ-9
Cisco IP Phone 7821 – VoIP phone – SIP, SRTP – 2 lines – charcoal
