Plantronics Calisto P240 USB Handset
This is a portable USB handset for PC communications, it has noise cancelling microphone, wideband audio and a familiar handset desing.
Calisto P240 makes the evolution of PC communications easy and really simple. This handset has LCD display allowing you to see who is calling and also it has embedded full duplex speakerpone which ensures hands free convenience. Such functions as answering, dialing, redialing and mute are as easy as pushing a button. Topped up with line audio technology, it sound really nice. When you are on the move, the Plantronics Calisto 240 easily fits into you pouch that is easy to put into you laptop bag or carry along, thus allowing making calls from personal computer as easy as it can be at any place you migh be.
Key features:
LCD Screen (for caller ID and easy menu navigation)
Noise cancelling microphone
Integrated full duplex speakerphone
Sound Guard
Slim and portable design
Powered via USB
Carrying pouch included
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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