VVX400 not respecting DSCP setting

Occasional Visitor

VVX400 not respecting DSCP setting

I have been trying to configure QoS settings on our small fleet of polycom VVX 400 series phones and it appears that the phones are sending the "802.1Q User Priority" setting instead of the value that I am providing for the "IP DSCP (overrides IP ToS)" field. Is this a bug or am I misunderstanding how these settings work? I have attached an exported copy of an example phone's configuration and a screen capture of the wireshark trace that shows the incorrectly set DSCP values (DSCP is set to 40 and value should be 46).


Phone Model: VVX 400

Part Number: 3111-46157-002 Rev:A

MAC Address: 64:16:7F:A9:26:12

UC Software Version:

Updater Version:

Call Platform: SfB (Online)



Polycom Employee & Community Manager

Re: VVX400 not respecting DSCP setting

Hello @swes1110 ,


welcome to the Polycom Community.

Please ensure you always check the FAQ's and/or utilize the community search before posting any new topics or follow up post’s.


Office 365 can provision parameters to the VVX which have higher priority.


Jul 31, 2017 Question:How can I prevent a Polycom VVX Phone or a Polycom Trio to accept some settings automatically via Skype for Business and/or Office365?

Resolution: Please check this post => here <=


Part of this is as example DSCP


Please disable the suggested lync.provisionDeviceParams.enabled parameter and if this does not work provide us with a backup.


In addition you should be testing UC Software 5.8.3


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

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The above is necessary in order to track issue internally within Polycom.

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Message 2 of 3
Occasional Visitor

Re: VVX400 not respecting DSCP setting

Thanks Steffen,


Adding the following setting to our configuration file resolved the issue. I will do some further testing to ensure that no other settings that we require are affected by this change. 



Message 3 of 3