Yealink SIP-T2 SERIES Administrator's Manual page 901

Configuring Security Features
3) In the CA Certificates field, click Browse to select the desired CA certificate
(*.pem, *.crt, *.cer or *.der) from your local system.
4) Click Upload to upload the certificate.
f) If you select EAP-TTLS/EAP-GTC:
1) Enter the user name for authentication in the Identity field.
2) Enter the password for authentication in the MD5 Password field.
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