Datasheet

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Features
Specifications
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Lithuanian (Lithuania)
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Korean (Korea Republic)
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Norwegian (Norway)
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Polish (Poland)
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Portuguese (Portugal)
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Portuguese (Brazil)
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Romanian (Romania)
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Russian (Russian Federation)
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Spanish (Columbia)
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Spanish (Spain)
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Slovak (Slovakia)
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Swedish (Sweden)
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Serbian (Republic of Serbia)
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Serbian (Republic of Montenegro)
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Slovenian (Slovenia)
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Thai (Thailand)
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Turkish (Turkey)
Multiple ring tones
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The phone supports user-adjustable ring tones.
Directories
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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
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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.
Security
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Certificates
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Image authentication
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Device authentication
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File authentication
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Signaling authentication
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Media encryption using Secure Real-Time Transfer Protocol (SRTP) using AES-128
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Signaling encryption using Transport Layer Security (TLS) Protocol using AES-128 or AES-256
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Encrypted configuration files
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802.1X authentication
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Cryptography
Configuration options
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The user can configure IP address assignment statically or through the DHCP client.
Physical dimensions (H×W×D)
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IP Phone 7811: 207 x 195 x 33mm (exclude foot stand)
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IP Phone 7821: 207 x 206 x 28mm (exclude foot stand)
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IP Phone 7841: 207 x 206 x 28mm (exclude foot stand)
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IP Phone 7861: 207 x 265 x 28mm (exclude foot stand)
Weight
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IP Phone 7811: 806g
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IP Phone 7821: 867g
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IP Phone 7841: 868g
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IP Phone 7861: 1053g
Display
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IP Phone 7821, 7841, 7861: 3.5” 396×162 pixels
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IP Phone 7811: 3.28” 384×106 pixels
Ethernet switch
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The phone has a 10/100BASE-T (The Cisco
®
IP Phone 7811, 7821 & 7861) or a10/100/1000BASE-T (The
Cisco
®
IP Phone 7841) Ethernet connection through two RJ-45 ports, one for the LAN connection and the
other for a downstream Ethernet device connection like a PC.
Phone casing composition
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Polycarbonate acrylonitrile butadiene styrene (ABS) textured plastic.
Power requirements
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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.
Operational temperature
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32 to 104°F (0 to 40°C)
Nonoperational temperature
shock
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14 to 140°F (-10 to 60°C)