Yealink VC400 Administrator's Guide

Troubleshooting
291
Why does the far-site display black screen when local starts a
presentation?
This situation may due to the difference between Signaling Server address and the Media Server
address.
The actual address is different from the negotiated address, so that start a presentation in this
situation will result in the failure of sending packets to the correct address. You can disable the
network adaptive feature, so that the system will send packets to the negotiated address other
than the actual address.
Network address adapter parameter is described below:
Parameter
Description
Configuration Method
Network Address
Adapter
Enable or disable the network
address adapter feature.
Valid values:
 Enabled-send packets to the
actual address.
 Disabled- send packets to the
negotiated address other than
the actual address.
Default: Enabled
Web User Interface
To configure the network address adapter via web user interface:
1. Click on Setting->Call Features.

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