Yealink VC400 Administrator's Manual page 257

Parameter
Rules of SRTP for media encryption in SIP calls:
Far
Compulsory
Optional
Disabled
When SRTP is enabled on both systems, RTP streams will be encrypted, and the lock icon
appears on the display device of each system after successful negotiation.
Note
If SRTP is enabled for the
type to TLS. This ensures the security of SRTP encryption. For more information on TLS, refer to
Transport Layer Security
To configure SRTP for Zoom/Pexip/BlueJeans/Mind/Custom platform via web user
interface:
Click on Account->Cloud.
1.
Select Zoom/Pexip/BlueJeans/Mind/Custom from the pull-down list of Platform Type.
2.
Description
Disabled—do not use SRTP in SIP calls.

Optional—negotiate with the far site

whether to use SRTP for media
encryption in SIP calls.
Compulsory—compulsory use SRTP for

media encryption in SIP calls.
Default: Disabled
Note: You cannot configure it for the
Yealink/StarLeaf Cloud platform.
Near Compulsory
SRTP Call
SRTP Call
Fail to establish call
Cloud platform
on page 232.
Optional
SRTP Call
SRTP Call
RTP Call
or SIP account, you should also configure the transport
Configuring Security Features
Configuration Method
Disabled
Fail to establish call
RTP Call
RTP Call
241