Yealink VC120, Administrator'S Manual

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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.