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cisco ip phone 7821 features:
power over ethernet or ac power
signaling protocol support sip
codec support g.711a/μ, g.722, g.729ab, ilbc
identifies incoming messages and categorizes them for users on the screen
10/100base-t ethernet connection through two rj-45 ports
supports cdp and 802.1q/p standards, and can be configured with an 801.1q vlan header containing the vlan id overrides configured by the admin vlan id
other handsets
cisco cp-7861-k9
cisco cp-7841-k9
cisco cp-7811-k9