Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones 
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2.  Click Browse to select the certificate (*.pem, *.crt, *.cer or *.der) from your local system. 
 
3.  Click Upload to upload the certificate. 
To configure the server certificates via web user interface: 
1.  Click on Security->Server Certificates. 
2.  Select the desired value from the pull-down list of Device Certificates. 
 
3.  Click Confirm to accept the change. 
To upload a server certificate via web user interface: 
1.  Click on Security->Server Certificates.