Yealink VC400 Administrator's Manual page 259

Click Confirm to accept the change.
3.
To configure SRTP for SIP IP call via web user interface:
Click on Account->SIP IP Call.
1.
Select the desired value from the pull-down list of SRTP.
2.
Click Confirm to accept the change.
3.
H.235
Yealink video conferencing systems support H.235 128-bit AES algorithm using the
Diffie-Hellman key exchange protocol in H.323 calls. To use H.235 feature for H.323 calls, the
participants in the call must enable the H.235 feature simultaneously. When a site places a call
on the H.235 feature enabled system, the system negotiates the encryption algorithm with the
destination system.
The H.235 parameter on the system is described below:
Parameter
H.235 Encryption
Description
Specifies the H.235 type. You can
configure it for the StarLeaf Cloud
platform or H.323 call separately.
Disabled—do not use H.235 in

H.323 calls.
Optional—negotiate with the

far site whether to use H.235 in
H.323 calls.
Compulsory—compulsively

use H.235 in H.323 calls.
Default: Disabled
Configuring Security Features
Configuration Method
Web User Interface
243