Cisco CP-7821-K9-V04

The Cisco CP-7821-K9-V04 is a 2-line enterprise-grade VoIP desktop IP phone designed for small-to-large business communication. The "V04" suffix signifies the specific hardware revision version of the standard CP-7821-K9 model, ensuring current component compatibility with Cisco Call Control platforms. It features a high-resolution graphical monochrome display, dedicated fixed keys for navigation, and advanced telephony integration. Key Specifications • Lines Supported: 2 lines (via 2 programmable line keys with tri-color LEDs). • Display: 3.5-inch grayscale LCD display with a high-resolution 396 x 162 pixel layout and integrated backlighting. • Network Switch: Integrated dual 10/100BASE-T Fast Ethernet ports supporting co-located PC passthrough. • Power Requirements: Native IEEE 802.3af Power over Ethernet (PoE) Class 1 device. It can also be powered locally using an optional Cisco Power Cube 3 Adapter. • Audio Features: High-definition full-duplex wideband speakerphone, wideband handset audio, Echo Cancellation, and a dedicated RJ-9 headset jack. • Voice Codecs: Broad codec support including G.711a/μ, G.722, G.729a/b, iLBC, and OPUS. System Compatibility & Call Features • Firmware Protocol: Supports standard Session Initiation Protocol (SIP) signaling. • Call Control Support: Fully compatible with Cisco Unified Communications Manager (CUCM) versions 8.5.1 or later, Cisco Business Edition 6000, Cisco Hosted Collaboration Solution (HCS), and Webex Calling platforms. • Core Call Functions: Supports Abbreviated Dialing, Busy Lamp Field (BLF), Call Forward/Hold/Transfer, Call Pickup, Directory Integration (LDAP), and voicemail. Security & Administration • Device Protection: Features secure boot, image authentication, device authentication, and encrypted configuration files. • Encryption Standards: Media encryption utilizing Secure Real-Time Transfer Protocol (SRTP) with AES-128 and signaling encryption through Transport Layer Security (TLS) via AES-128/256.