Poly VVX 401 5.9.0 Upgrade

Occasional Visitor

Poly VVX 401 5.9.0 Upgrade



I've been working on upgrading roughly 25 Poly VVX 401 handsets from to The firmware upgrades, but then downgrades roughly 24 hours later. The Poly CCX 401 devices are registered to Microsoft Teams and are on the skype for business platform. The O365 tenant is Microsoft Teams. I've gone through compatibility matrix's, checked MS teams documentation and Poly's. I can't tell if there is another supported firmware version for the Poly 401 phones with MS Teams or if these devices need to convert as MS Teams SIP Gateway devices, or perhaps the Poly 401 phones are retired for MS Teams. Anyone else run into this? 

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Polycom Employee & Community Manager

Re: Poly VVX 401 5.9.0 Upgrade

Hello @Wahl ,


Welcome to the Poly Community.
I can only recommend checking the Community FAq and/or searching for similar posts


From our FAQ:


Feb 02, 2016 Question: How can I prevent a Poly Phone to be downgraded/upgraded or change settings automatically via Skype for Business and/or Microsoft Teams 3PIP gateway?

Resolution: For Skype for Busines please download, unpack and import the attached LyncProvisionDeviceParams. For Microsoft Teams 3PIP gateway in addition please set the EnableDeviceUpdate to false as explained => here <=


Please ensure you familiarise yourself with the FAQs listed in my signature for your convenience.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier



If official support is required please check how to phone or open a case here

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.


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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.
Please also ensure you always check the VoIP , Video Endpoint , Microsoft Voice , PSTN or other FAQ's in the different sections
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