The Cisco IP Phone 7821 is designed for small to large businesses. It delivers advanced IP Telephony features and crystal clear wideband audio performance to deliver an easy-to-use, full-featured voice communications experience on Cisco on-premises and hosted infrastructure platforms and third party hosted call control.
Figure 1 shows the appearance of the CP-7821-K9.
Table 1 shows the Quick Spec.
384 x 106 pixel (3.28 in. / 83.3 mm)
Programmable Line Keys
Full Duplex Speakerphone
Number of Line Keys
Third-party Call Control
Before you use the Cisco IP Phone 7821, it should be connected to the corporate IP telephony network.
Figure 2 shows the bottom ports of this IP Phone.
① AC power wall plug (optional)
② Network port (10/100 SW) connection. IEEE 802.3af power enabled
③ Access port (10/100 PC) connection
④ Auxiliary port (optional)
⑤ Handset connection
⑥ Analog headset connection (optional)
Figure 3 shows the buttons and hardware.
① Handset light strip ② Programmable feature buttons ③ Phone screen ④ Softkey buttons ⑤ Navigation and Select button ⑥ Hold/Resume button
⑦ Conference button ⑧ Transfer button ⑨ Speakerphone button⑩ Headset button ⑪ Mute button ⑫ Keypad
⑬ Volume button ⑭ Contacts button ⑮ Applications button ⑯ Messages button ⑰ Handset
Figure 4 shows the unboxing view of CP-7821-K9.
Compare to Similar Items
Table 2 shows the comparison of Cisco IP Phone 7811, 7821, 7841 and 7861.
Programable line keys
Number of Line Keys
Full duplex speakerphone
Third-party call control
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Signaling protocol support
● Session Initiation Protocol (SIP)
● G.711a/μ, G.722, G.729a, iLBC
Key call features support
● + Dialing (E.164)
● Abbreviated dial
● Adjustable ringing and volume levels
● Adjustable display contrast
● Agent greeting
● Auto-detection of headset (Not available on the IP Phone 7811)
● Busy Lamp Field (BLF) (Not available on the IP Phone 7811)
● Call back
● Call forward
● Call history
● Call park
● Call Pickup
● Call timer
● Call waiting
● Caller ID
● Corporate directory
● Cross Cluster Extension Mobility (EMCC)
● Dial from the list
● Direct transfer
● Do not disturb
● Extension Mobility (EM)
● Forced access codes and client matter codes
● Group call pickup
● Immediate divert
● Intercom (Not available on the IP Phone 7811)
● Join (Not available on the IP Phone 7811)
● Message-waiting indicator
● Meet me conference
● Music on hold
● Network profiles (automatic)
● On- and off-network distinctive ringing
● Personal directory
● Private Line Automated Ringdown (PLAR)
● Ring tone per line appearance
● Shared line
● Silent monitoring and recording
● Speed dial
● Time and date display
● Whisper coaching
● Arabic (Arabic Area)
● Bulgarian (Bulgaria)
● Catalan (Spain)
● Chinese (China)
● Chinese (Hong Kong)
● Chinese (Taiwan)
● Croatian (Croatia)
● Czech (Czech Republic)
● Danish (Denmark)
● Dutch (Netherlands)
● English (United Kingdom)
● Estonian (Estonia)
● French (France)
● Finnish (Finland)
● German (Germany)
● Greek (Greece)
● Hebrew (Israel)
● Hungarian (Hungary)
● Italian (Italy)
● Japanese (Japan)
● Latvian (Latvia)
● Lithuanian (Lithuania)
● Korean (Korea Republic)
● Norwegian (Norway)
● Polish (Poland)
● Portuguese (Portugal)
● Portuguese (Brazil)
● Romanian (Romania)
● Russian (Russian Federation)
● Spanish (Columbia)
● Spanish (Spain)
● Slovak (Slovakia)
● Swedish (Sweden)
● Serbian (Republic of Serbia)
● Serbian (Republic of Montenegro)
● Slovenian (Slovenia)
● Thai (Thailand)
● Turkish (Turkey)
Multiple ring tones
● The phone supports user-adjustable ring tones.
● The phone identifies incoming messages and categorizes them for users on the screen.
This makes it fast and easy to return calls using direct dial-back capability. The corporate
directory integrates with the Lightweight Directory Access Protocol (LDAP) standard directory.
Quality-of-service (QoS) options
● The phone 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.
● Image authentication
● Device authentication
● File authentication
● Signaling authentication
● Media encryption using Secure Real-Time Transfer Protocol (SRTP) using AES-128
● Signaling encryption using Transport Layer Security (TLS) Protocol using AES-128 or AES-256
● Encrypted configuration files
● 802.1X authentication
● The user can configure IP address assignment statically or through the DHCP client.
Physical dimensions (H×W×D)
● IP Phone 7821: 207 x 206 x 28mm (exclude foot stand)
● IP Phone 7821: 867g
● IP Phone 7821: 3.5” 396×162 pixels
● The phone has a 10/100BASE-T or a 10/100/1000BASE-T
Phone casing composition
● Polycarbonate acrylonitrile butadiene styrene (ABS) textured plastic.
● The phone is an interoperable IEEE 802.3af PoE (Class 1 device); 48 VDC is required;
it can be supplied locally at the desktop using an optional AC-to-DC power supply (CP-PWR-CUBE-3=).
Use of the power supply also requires the use of one of the corresponding AC country cords.
● 32 to 104°F (0 to 40°C)
Nonoperational temperature shock
● 14 to 140°F (-10 to 60°C)
● Operating 10% to 90%, non-condensing
● Non-operating 10% to 95%, non-condensing
● Cisco cosmetic class A
Certification and compliance
● Regulatory Compliance
◦ CE Markings per directives 2004/108/EC and 2006/95/EC
◦ UL 60950 Second Edition
◦ CAN/CSA-C22.2 No. 60950 Second Edition
◦ EN 60950 Second Edition (including A11 & A12)
◦ IEC 60950 Second Edition (including A11 & A12)
◦ AS/NZS 60950
● EMC - Emissions
◦ 47CFR Part 15 (CFR 47) Class B
◦ AS/NZS CISPR22 Class B
◦ CISPR22: 2005 w/Amendment 1: 2005 Class B
◦ EN55022: 2006 w/Amendment 1: 2007 Class B
◦ ICES003 Class B
◦ VCCI Class B
◦ KN22 Class B
● EMC - Immunity
◦ Armadillo Light
◦ FCC Part 68 HAC
◦ AS/ACIF S004
◦ AS/ACIF S040
◦ NZ PTC 220
◦ Industry Standards: TIA 810 and TIA 920
◦ Industry Standards: IEEE 802.3 Ethernet, IEEE 802.3af and 802.3at
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