Yealink VC400 Administrator's Guide

Configuring Security Features
265
Defending against Attacks
VCS sometimes receives calls from unknown caller, and the calls may be unable to answer. To
ensure the communications security of the VCS, you can configure abnormal call answering
feature for handling abnormal SIP incoming calls. For incoming H.323 calls, you can configure
Safe Mode Call feature.
Abnormal Call Answering
When destination address of the incoming SIP call does not match local address, the call is
considered to be an abnormal call. You can reject the abnormal SIP incoming call, or answer it
using IP address or SIP account randomly.
The abnormal call answering parameter on the system is described below:
Parameter
Description
Configuration Method
Abnormal Call
Answering
Specifies the account type for
answering abnormal SIP incoming
calls.
 Disabled—reject the abnormal
SIP incoming calls.
 Account Answer—use the SIP
account to answer the
abnormal SIP incoming calls.
 IP Call Answer—use IP
address to answer the
abnormal SIP incoming calls.
Default: IP Call Answer
Web User Interface
To configure abnormal call answering 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