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VVX400 and Skype for Business

Occasional Visitor

VVX400 and Skype for Business

I have been trying to connect my VVX400 to Skype for a week now without success. I have tried multiple different versions of UCS, I have reset the phone to factory defaults and I have worked with Microsoft to troubleshoot.


Current configuration is as follows...

Skype for Business 2016 MSO - 16.0.8431.2110 (32-bit)
Update Polycom VVX400 - UCS -
Install BToE Connector - (32-bit)


I have attached the boot and app log file for review.


Thanks in advance.

Polycom Employee & Community Manager

Re: VVX400 and Skype for Business

Hello @sbaugher,

welcome to the Polycom Community.

The community's Skype for Business FAQ contains this post here:

Jan 17, 2017 Question:How can I troubleshoot simple Skype for Business, LYNC or Office365 issues?

Resolution: Have a look => here <=

Checking your log:


0503102010|sip  |4|00|Registration failed User: sbaugher, Error Code:404 Not Found

Maybe you added your credentials wrong?

Please be aware that for this VVX400 (0004f2d5dc82) and any other similar old device you must purchase a Polycom Skype for Business license if you want to use this with Microsoft Skype for Business.


I explain this => here <=

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

Best Regards

Steffen Baier

Polycom Global Services

The title Polycom 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. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.


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
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