Encryption
Certificate file
Certificate file exported from PBX. Always use the PBX certificate, not the Root certificate.
You will find the certificate on the PBX's as follows: Administration > Certificate > SIPS/SRTP internal.
Use certificate as
Do not use
The certificate set here will not be used.
Default
The certificate is used that may be set under Settings > Functions > Advanced > TLS.
Note: Do not use this option here. Do not store a certificate on the specified path.Use certificate
The certificate set here will be used.
Generate self-signed certificate
A self-signed certificate will be created and used.
SRTP key negotiation
Select if encryption is to be performed using the protocol SDES.
Further help under Provisioned Settings: AccountsEnable ZRTP
Note: This transport protocol is not supported by the PBXs.