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VVX 311 Phones won't accept DHCP address

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VVX 311 Phones won't accept DHCP address

We are replacing CX600 phones with VVX 311 phone and are running into a problem where the new VVX311 phones sometimes do not accept DHCP offers from our servers. We have switch policy that auto-assigns LLDP-MED and we see the device identified and the correct VLAN tagged on the switch automatically. The old CX600s work flawlessly and the VVX311s only sometimes work. We have moved phones from one port to another, and then replaced them, and cannot find a consistent location-based problem. Phones with the issue would then start working at random points. I found a similar issue with VVX411 listed with Extreme for Enterasys switches, but firmware notes listed the issue as fixed as of 5.3.XX


Out of the box firmware : 

Enterasys Switches:  c5k-series

Skype for Business Cloud services for VOIP service.

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Polycom Employee & Community Manager

Re: VVX 311 Phones won't accept DHCP address

Hello @tylerb,

welcome to the Polycom Community.


The VVX phones in comparison with the CX phones have far more sophisticated method's of discovering VLAN's as an example using CDP,LLDP or even DHCP so you may not be able to compare them side by side.

The community's VoIP FAQ contains this post here:

Aug 24, 2015 Question:What basic network data is send and received by a Polycom phone?

Resolution: Please check this post => here <=




Oct 17, 2011 Question: How can change Logging Levels or use Syslog?

Resolution: Please check => 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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