Grandstream GXP 2120

GXP2120 is an IP Phone of a new generation. It has six lines, a large LCD screen with a 320x160 resolution, 4 programmable context-sensitive soft keys (XML), 7 programmable speed dial keys with BLF support, two network PoE ports and probability of five-sided conference.

GXP2120 provides a superior HD audio quality, high functionality, custom applications, automated provisioning for easy large-scale installations, enhanced security, and compatibility with most SIP devices and platforms from other manufacturers. This device is the flagship of the series and differs from other devices from the series by a large screen and support for up to six SIP accounts simultaneously.

Technical characteristics:
LCD display with a 320x160 pixel resolution, 8 levels of gray scale. Wide HD audio support, superb full-duplex speakerphone with advanced echo cancellation and excellent quality two-way conversation. Automated services (weather, stock quotes, exchange rate, RSS feeds, etc.), custom ringtones, back tones, music on hold using Internet streaming or local music, customizable screen content (XML), enhanced integration with the Internet applications.

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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