Yealink VC880 - Defending against Attacks

| Configuring the Security Features | 210
2. Configure and save the following settings:
Parameter Description Configuration Method
H.235
Configure the H.235 encryption.
The supported types are as
follows:
• Disabled—the encrypted calls
are not supported.
• Optional—both the
encrypted and the
unencrypted calls are
supported. The secure calls
are supported only if the far
end supports encryption.
• Compulsory—unencrypted
calls are not supported.
Default: Disabled.
Web user interface
When H.235 is enabled on both sites, RTP streams will be encrypted, and a lock icon appears on the
monitor of each system after successful negotiation.
Defending against Attacks
VCS sometimes may receive calls from unknown caller, and the calls may be unable to answer. For the
communication security, VCS supports the features of defending against attacks. You can configure the
abnormal call answering feature to handle the abnormal SIP incoming call or configure the safe mode call
feature to verify the H.323 incoming call.
• Configuring Abnormal Call Answering
• Configuring the Safe Mode Call
Configuring Abnormal Call Answering
When the destination address of the incoming SIP call does not match the local address, the call is
considered to be an abnormal call. You can deal with them by setting them as the abnormal SIP incoming
call. You can reject the abnormal SIP incoming call, or answer it by using IP address or SIP account
randomly. This feature is not applicable to VP59.
Procedure
1. On your web user interface, go to Setting > Call Features > Abnormal Call Answering.