Yealink SIP-T28P

IP Phone Yealink SIP-T28P has all the advantages of other devices from Yealink’s product range: convenient handset, the optimal angle of the screen, high-definition audio that meets IEEE1329 standards, ten additional programmable keys to automate most common actions and LED status indication of contacts whose numbers are set to speed dial.

SIP-T28P can simultaneously connect up to independent SIP accounts; buttons with LED backlight allow you to quickly switch lines before dialing or directly during the conversation. As in the previous models, these buttons can be programmed along with ten programmable buttons on the right side of the phone.
Another distinctive feature of this model is the large backlit graphic display that simplifies interaction with the phone starting with the pre-configuration of network settings and finishing with function for everyday work.

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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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Net2phone

Since its inception in 1996, Net2Phone has established itself as a world leader in delivering voice services over data networks. Recognized as a pioneer in bridging the Internet with the public switched telephone network, Net2Phone provides partners such