Yealink SIP-T46G Administrator's Manual page 209

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To upload a trusted certificate via web user interface:
1.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
Select the desired value from the pull-down list of CA 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->Trusted Certificates.
Configuring Security Features
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