Grandstream BT 201 IP Phone

The Budgetone Series from Grandstream brings to the world highly cost-competitive, latest generation SIP phones. In designing Budgetone series a goal was to employ its groundbreaking innovative technology in order to delver to the market IP phones that will provide their users with unparalleled sound quality, extensive list of features, and simplicity - all at an incredibly low price.

The Grandstream BT 201 is without a doubt ne of the most desirable, feature rich phone in the BudgeTone series. The BT 201 model supports an number of highly technologically advanced telephony features incorporating a full-duplex hands-free loudspeaker with advanced acoustic echo cancellation technology, 10M/100M Ethernet port, a number of popular audio codecs, voicemail with visual indicator and custom ringtones, all in all putting up unbelievable value to both business and consumer market. But if you already have a set up of analogue phones, maybe you might be interested interconnecting your setup with Grandstream ATA HandyTone-502 Analog Telephone Adapter the latest product in the HandyTone series product line.

The Grandstream BT 201 specifications include:
• 1x 100 Mbps auto sensing Ethernet RJ45 ports • 1x LAN RJ45 10/100Mbps • 1x 2.5mm Headset Port • 1x LED (red color) • 1x Full-duplex loudspeaker • 25-Keys Keypad and 12-Digit CallID LCD display • SRTP, TLS • Voicemail light indicator • FCC / CE / C-Tick Compliance • All of the standard features and functionality of voice • Fully compatible and Interoperable with SIP platforms • Power Adapter Input: UL certified, 100-240VAC 50-60 Hz, Output: +5VDC, 1200mA • Dimensions: 18cm x 22cm x 6.5cm W/D/H

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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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