Cisco 6921 Unified IP Phone

Cisco 6921 Unified IP Phone

Cisco 6921 is inexpensive business class IP phone model supporting video connection (Cisco UC Phone 6921, Standard Handset).
Cisco 6921 IP phone supports up to 2 lines has full-duplex loudspeaker, supports call holding on each line, hold, transfer, conference keys, tricolor indication of line condition, functional keys for simplified use of IP phone functions.

Additionally CP-6921 model has energy saving mode (deep sleep), reducing the energy consumption by 50% during of work hours.
Technical Characteristics:
Monochrome graphical 396 x 81 pixel LCD display, with white backlight and anti-reflection cover is optimized to work under different lighting conditions. 2 line keys with tricolor backlight for quick identification of call status 2 Ethernet 10/100BASE-T ports “Deep Sleep” energy saving mode, reducing the energy consumption by 50% during of work hours. VT Camera and Cisco Unified Video Advantage software (has to be purchased separately) for making the phone calls with using PC. Codec Support: G.711a, G.711, G.729a, G.729b and audio compression codec G.729ab Power voltage of 48 V DC, supplied with the assistance of option power block CP-PWR-CUBE-3 or power injector CP-PWR-INJ

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VoIP Favors SIP

VoIP Favors SIPSession Initiation Protocol (SIP) is a text-based standard put in place by the Internet Engineering Task Force (IETF) and is the primary protocol for Voice over Internet Protocol services. SIP is similar to a MGCP in that it's a signaling protocol that can create, maintain and terminate sessions in IP-based networks. These sessions include multimedia conferencing and two-way phone calls. SIP protocol can run on User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP) because it was created to function independently from the underlying Transport Layer as an Application Layer.

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