Grandstream GXP280 and GXP285

Small enterprises should really enjoy the Grandstream GXP280 and GXP285 devices, due to mixture of high quality of sound, graphic LCD display and rich list of business features.

These devices support only one SIP line. Both models have built in 10/100Mbps network ports with support of Ethernet power supply (802.3af PoE – only on GXP285) and full duplex speaker phone with echo cancellation, 1 phone line with FLASH function allowing to accept 2 simultaneous calls, 3 XML soft keys and a headphone jack. GXP280 and GXP285 IP phone models are a best choice for SOHO segment users due to such functions as: autodial without picking up the handset, auto reply, quick dial, downloadable ringtones, support for reserve servers and protection from errors. Phone has security features supporting SRTP and AES protocols.
Devices support one phone line and have Flash function supporting up to 2 simultaneous calls Two 10/100M Ethernet ports High quality broadband sound and full duplex speakerphone with enhanced echo cancellation feature. LCD display with 128x32 resolution support several languages Compatibility with most of IP-PBX platforms and SIP devices.

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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