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Skype for Business Sign-in failing on VVX 500 and 310 phone.

Occasional Advisor

Skype for Business Sign-in failing on VVX 500 and 310 phone.

Good morning everyone, here is my problem. Thank you in advance for any assistance. I have several phones I'm trying to move from 8x8 to Sfb online. I factory reset the phones and upgraded their UC software via web interface to version, changed the mode over to Skype. 


Here is some additional information


- This is a domain network, so I have added the internal DNS records required for Skype for Business online, the normal skype clients work great.

-We use microsoft federated services to authenticate with office 365, like above the normal sfb client works great internally. 

-My skype for business account has cloud PBX enabled. 



When I try to sign in via the phone or using BToE 3.3.0 app it sits on Signing in as and never connects. Here are the logs from the phone. See attachment. 


Polycom Employee & Community Manager

Re: Skype for Business Sign-in failing on VVX 500 and 310 phone.


As stated in the FAQ and the Relase Notes 5.5.0 is not a Skype / Lync supported software

Please downgrade and contact Microsoft support for any deployment issues

Replied via a mobile device

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Message 2 of 3
Occasional Advisor

Re: Skype for Business Sign-in failing on VVX 500 and 310 phone.

Thank you for the Reply Steffen, I'm new to the fourms and I missed your static post about 5.5.0, I have downgraded the phones firmware to and tried again, it failed, I also tried as well. Same issue. I have opened a ticket with MS Skype support so maybe they can help. Also, I have taken the phone home to a different network and had the same issue. My Firewall is not blocking 5061 or 443 going out, we are however doing stateful inspection to allow traffic back in. 



I have included a updated log file from version to this message incase someone here wants to take a gander at why they think it's not working.