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The exact parameters you need to use for provisioning your own root certificate can be found in the common.cfg file in the provisioning template for your Yealink phone type.
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T4x
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Trusted Certificates | Tab Custom CA | Import Trusted Certificates
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T5x
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Trusted Certificates | Tab Custom CA | Import Trusted Certificates
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If the provisioning of phones cannot be performed via multicast due to the network infrastructure, you can also distribute the provisioning URL (e.g. https://172.20.1.1:9200/ippbx/client/v1.0/device/provision/) via DHCP option 66.
In this case, your DHCP server must support HTTPS protocol.
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