I have a Cisco 7821 IP Phone that was registered to a Cisco Call Manager. How do I change the OS to Spark OS so that I can register to our Spark Calling System?
In the Spark admin portal, the admin should be able to initiate a QR or 16 digit code tied to a user that when entered into the provisioning wizard of the phone will register it to Spark. Also the user can do this from the Self Service portal. The phone has to be on a current version of code for it to have the ability to do the provisioning wizard. Hope this helps.
If your phone was registered to CUCM previously, it will depend on your phone firmware version which was pushed
from the version of your CUCM. You can try to reset phone in to factory default and if that does not work, you may need to download latest firmware and upgrade to latest firmware.
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