Yealink SIP-T2 Series Administrator's Manual page 392

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
Parameter static.trusted_certificates.url
It configures the access URL of the custom trusted certificate used to authenticate the connecting server.
Example:
Description
static.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.
Permitted
URL within 511 characters
Values
Default Blank
Web UI Security->Trusted Certificates->Load Trusted Certificates File
Parameter static.trusted_certificates.delete
It deletes all uploaded trusted certificates.
Description Example:
static.trusted_certificates.delete = http://localhost/all
Permitted
http://localhost/all
Values
Default Blank
Parameter static.server_certificates.url
It configures the access URL of the certificate the IP phone sends for authentication.
Example:
Description
static.server_certificates.url = http://192.168.1.20/ca.pem
Note: The certificate you want to upload must be in *.pem or *.cer format.
Permitted
URL within 511 characters
Values
Default Blank
Web UI Security->Server Certificates->Load Server Certificates File
Parameter static.server_certificates.delete
It deletes all uploaded server certificates.
Description Example:
static.server_certificates.delete = http://localhost/all
Permitted
http://localhost/all
Values
Default Blank
Parameter static.phone_setting.reserve_certs_enable
Description It enables or disables the IP phone to reserve custom certificates after it is reset to factory defaults.
Permitted
0-Disabled
1-Enabled
Values
386
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg