Yealink VC400, Administrator'S Manual

Page: 261 / 299

Configuring Security Features
245
2.
Select the desired value from the pull-down list of
H.235 Encryption
.
3.
Click
Confirm
to accept the change.
Attack Defense in Public Network
VoIP phones often suffer from network attacks in public network, which results in
communication failure. To ensure the safety of the enterprise VoIP phone, you can configure
abnormal call answering feature for handling abnormal calls using the SIP protocol. For
abnormal calls using the H.323 protocol, you can configure safe mode call feature to handle
them.
Abnormal Call Answering
The abnormal call answering parameters on the system are described below:
Parameter Description Configuration Method
Abnormal Call
Answering
Specifies the account type for
answering SIP incoming call
Specifies the account type for
answering SIP incoming call from
public network.

Disabled
—reject the SIP
incoming call from public
Web User Interface