Yealink VC400 Administrator's Guide

Configuring Call Preferences
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2. Select the desired value from the pull-down list of DTMF Type.
3. Click Confirm to accept the change.
Codecs
CODEC is an abbreviation of COmpress-DECompress, and is capable of coding or decoding a
digital data stream or signal by implementing an algorithm. The object of the algorithm is to
represent the high-fidelity audio/video signal with a minimum number of bits while retaining
quality. This can effectively reduce the frame size and the bandwidth required for audio/video
transmission.
Audio Codecs
The audio codec that the system uses to establish a call should be supported by the server.
When placing a call, the system will offer the enabled audio codec list to the server and then use
the audio codec negotiated with the called party according to the priority.
The following table summarizes the supported audio codecs on the system:
Codec
Algorithm
Bit Rate
Sample Rate
Reference
G.722.1c
G.722.1
48 Kbps
32 Ksps
RFC 5577
G.722.1c
32 Kbps
32 Ksps
RFC 5577
G.722.1c
24 Kbps
32 Ksps
RFC 5577

Yealink VC400 Specifications

General

Optical zoom	18 x
White balance	Auto, Indoor, Outdoor
Focus adjustment	Auto
Video codecs	H.264, H.264, H.263
Supported video modes	1080p
Supported graphics resolutions	352 x 288, 704 x 576, 1280 x 720 (HD 720), 1920 x 1080 (HD 1080)
Voice codecs	G.711, G.711a, G.722
Line-in	Yes
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
ITU-supported standards	H.323
Ethernet LAN data rates	10, 100, 1000 Mbit/s
AC input voltage	100-240 V
Power consumption (max)	30 W

Weight and Dimensions

Depth	183 mm
Width	330 mm
Height	40 mm