Thanks for your reply!
Here are the different attributes.
The level of encryption between Unified Communications entities.
Valid values:
SupportEncryption - secure real-time transport protocol (SRTP) will be used if it can be negotiated.
RequireEncryption - SRTP must be negotiated.
DoNotSupportEncryption - SRTP must not be used.
This value is not case sensitive. (For details, see the Examples in this topic.)
Default: RequireEncryption
Regards
Jonatan