Polycom SoundPoint IP321/331

SoundPoint IP 321/331 is a SIP phone with 2-line support, which has excellent quality of sound and the wide range of IP telephony features. SoundPoint IP 321 has one 10/100 Ethernet port (331 model has two ports), through which it can be used in areas such as lobbies, hallways, resting rooms. You can also mount this device on the wall.

SoundPoint IP 321/331 phone has a full-duplex speakerphone (IEEE 1329 Type 1) with Polycom's legendary Acoustic Clarity technology that provides excellent sound quality and echo and noise free communication, as if the conversation is with the person standing next to you.
Phone is configured via an intuitive user interface; it has such features call hold, call parking, off-hook, call transfer and three-way conference, as well as more advanced features such as the use of a common line, XHTML support and processing of various types of calls.
These IP phones are designed to make installation, setup and modification much easier and more efficient. SoundPoint IP 321/331 phone, by default has to be placed on the table, but you can easily mount it on the wall without any additional accessories. Integrated support for IEEE 802.3af PoE allows flexible scanning and saving on cables. SoundPoint IP 321/331 supports remote maintenance and upgrade from different types of servers: FTP, TFTP, HTTP, or HTTPS. For the organization of a reliable and trouble-free operation, the phone supports software from the boot and call servers.

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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