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

Providers in database: 6433

SDP Protocols Are Used To Transmit Media Session Information

In 1998, the Internet Engineering Task Force (IETF) published the specification for a Session Description Protocol or SDP as a format that describes parameters for streaming media. The original IETF Proposed Standard was updated in 2006 as RFC 4566. Although the SDP was created as a feature of Session Announcement Protocol (SAP), it can be used with Real-time Transport Protocol, Real-time Streaming Protocol (RTSP), and Session Initiation Protocol, as well as a standalone protocol. Parameter negotiation, session announcement and session invitation are included in the descriptive sessions from the SDP protocol. Rather than transmit data like other types of protocols, an SDP negotiates between media type endpoints, format and properties involved. A session begins when a connection is established, and the session is terminated only after every endpoint is no longer participating.

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