Yealink SIP-T46G Administrator's Manual page 210

Administrator's Guide for SIP-T46G IP Phone
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To configure the server certificates feature via web user interface:
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To upload a server certificate via web user interface:
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VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
Click Browse to select the certificate (*.pem,*.crt, *.cer or *.der) from your local
system.
Click Upload to upload the certificate.
Click on Security->Server Certificates.
Select the desired value from the pull-down list of Device Certificates.
Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after reboot.
Click OK to reboot the IP phone.
Click on Security->Server Certificates.