Yealink SIP-T48G Administrator's Manual page 513

Parameters
Security->Trusted Certificates->Common Name Validation
Phone User Interface:
None
security.dev_cert
Description:
Configures the type of the device certificates for the IP phone to send for TLS
authentication
.
0-Default certificates
1-Custom certificates
Note: If you change this parameter, the IP phone will reboot to make the change
take effect.
Web User Interface:
Security->Server Certificates->Device Certificates
Phone User Interface:
None
trusted_certificates.url
Description:
Configures the access URL of the custom trusted certificate used to authenticate the
connecting server.
Example:
trusted_certificates.url = http://192.168.1.20/tc.crt
Note: The certificate you want to upload must be in *.pem, *.crt, *.cer or *.der
format.
Web User Interface:
Security->Trusted Certificates->Load trusted certificates file
Phone User Interface:
None
server_certificates.url
Description:
Configures the access URL of the certificate the IP phone sends for authentication.
Example:
Configuring Security Features
Permitted Values
0 or 1
URL within 511
characters
URL within 511
characters
Default
0
Blank
Blank
499