If you need to set up a remote worker, you must manually install a certificate to the phone. You can add the certificate using parameters included in the SkypeTrioSharedExample.cfg file. You also have the option to create your own XML configuration file and upload it to a phone using the Web Configuration Utility.

You can manually install certificates on a per-phone basis only. You must use Base64 format.

When phones are signed in and the software is downgraded, the phones will be in the signed-in state until the User Certificates are valid.

If you are setting up your network and you want more information on certificate options see Configure the Network.