VVX 500 POE Power request at Cisco Switch to high

Occasional Advisor

VVX 500 POE Power request at Cisco Switch to high


we are using VVX 500 Phones at Cisco 3850 Switches and the switch then are reservate 15.4 watt at the port. That are normaly to many, because the Phone only need max. 5.0 Watt.
If i configure a fixed Power from 7 Watt to the Switchport, the Phone is not working(Starting).

Is there any explanation why it doesn't work at 7 watts?



Message 1 of 3
Polycom Employee & Community Manager

Re: VVX 500 POE Power request at Cisco Switch to high

Hello @Oliver.R,


welcome back to the Polycom Community.

Both the community's Must Read First and the community's FAQ reference the basic minimum information a new or follow up post should contain.

This ensures the questions having to be asked are limited and any new or follow up post contains the right amount of details to ensure any voluntary participant within the community does not spend additional time chasing basic information.

As a reminder the basic information asked for:


  • Provide the exact Software Version of your Phone
  • Provide the Phone Model
  • Provide the Call Platform (aka openSIP, Skype for Business, Lync)
  • If applicable provide a backup of the phone in question

UC Software 4.0.0 or later via the Web Interface Utilities > Phone Backup & Restore > Phone Backup > Phone Backup

  • If possible provide a Log and either attach them or use the Code Tag.Consult the Troubleshooting Section found within the FAQ if applicable
  • If possible provide the MAC Address or Serial of the device
  • Provide details if the issue is a day 1 issue or only happened after an upgrade or any other relevant details



Whilst providing the answers to some of the above may not directly impact any possible answer the community can provide, it does enable Polycom to have an overview of the current software used and other details and allows us to look up a potential support partners if an issue needs to come into support.


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

Please be aware:

The purpose of these forums is to allow community members collaborate and help each other.
Questions posted here do not follow Polycom’s SLA guidelines.
If you require assistance from Polycom technical support, please open a
web service request or call us .

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

You are welcome to post more questions or configuration or logs for other community members to look at but if your issue requires a fix via Polycom you must go via the official support structure.

Please ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's

Please remember, if you see a post that helped you , and it answers your question, please mark it as an "Accept as Solution".

This forum reply or post is based upon my personal experience and does not reflect the opinion or view of my employer.
Polycom employee participation within this community is not mandatory and any post or FAQ article provided by myself is done either during my working hours or outside working hours, in my private time, and may be answered on weekends, bank holidays or personal holidays.
Message 2 of 3
Respected Contributor

Re: VVX 500 POE Power request at Cisco Switch to high

Hi @OliverR.,


as you can see from following document, VVX500 and VVX600 advertise as Class 4, on conformance with IEEE802.at. Therefore I think, maximum power Range used by the phone is 12,95–25,50 W.



Message 3 of 3