Do you have the details of the "old" software and the "new" software as this can be useful? Also what kind of provisioning was used in the original deployment aka DHCP Option? Could this link the phone back to the old server i.e. switch back?
A log from the phone would tell a lot. I suggest you use the FAQ and/or community search to assist you.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
---------------- The title Poly Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.
Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels. Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's