Yealink T46G Administrator's Manual page 342

Yealink Skype for Business HD IP Phones Administrator Guide
5) Click Upload to upload the certificates.
c) If you select EAP-PEAP/MSCHAPv2:
1) Enter the user name for authentication in the Identity field.
2) Enter the password for authentication in the MD5 Password field.
3) In the CA Certificates field, click Browse to select the desired CA certificate (*.pem,
*.crt, *.cer or *.der) from your local system.
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