Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones 
500 
server_certificates.url = http://192.168.1.20/ca.pem 
Note: The certificate you want to upload must be in *.pem or *.cer format. 
Web User Interface: 
Security->Server Certificates->Load server cer file 
Phone User Interface: 
None 
phone_setting.reserve_certs_enable 
Description: 
Enables or disables the IP phone to reserve custom certificates after it is reset to 
factory defaults. 
0-Disabled 
1-Enabled 
Web User Interface: 
None 
Phone User Interface: 
None 
To configure TLS on a per-line basis via web user interface: 
1.  Click on Account->Register. 
2.  Select the desired account from the pull-down list of Account. 
3.  Select TLS from the pull-down list of Transport. 
 
4.  Click Confirm to accept the change.