Yealink SIP-T54S Administrator's Manual page 156

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
In the CA Certificates field, click Browse to select the desired CA certificate
4)
(*.pem, *.crt, *.cer or *.der) from your local system.
Click Upload to upload the certificate.
5)
If you select EAP-FAST:
g)
(Optional.) Enter the anonymous user name for authentication in the
1)
Anonymous Identity field.
Enter the user name for authentication in the Identity field.
2)
Select the desired value from the pull-down list of Provisioning Mode.
3)
Enter the password for authentication in the MD5 Password field.
4)
In the CA Certificates field, click Browse to select the desired CA certificate
5)
(*.pem, *.crt, *.cer or *.der) from your local system.
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