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VVX ignore DHCP option 128 but Soundpoint do not on the same LAN

Occasional Visitor

VVX ignore DHCP option 128 but Soundpoint do not on the same LAN


Wanted to bounce this off the community for a sanity check.  I have a case where a production customer and our internal lab VVX phones ignore the DHCP option 128 for VLAN tagging.  In both cases, Broadcloud service and the option 128 was verified working but NO LONGER works...we see the VVX moving back to the data VLAN instead of following the option 128 VLAN identifier and going to the voice subnet.  Soundpoint models are NOT affected on the same LAN.  They happily join the voice VLAN.


CDP and LLDP are disabled on routers and switches and we're running 5.4 on the phones.  No errors in our router's DHCP pool for the option 128.  To state once more, the option used to work but for some reason now is being ignored.  No changes on the customer or lab.


When running PCAP's on the VVX, the DHCP looks normal up to a point - you see the standard Discover, Offer, Request, and Ack, but you never see the DHCP Release and then the process start over again but with the 802.1q.


Just for grins, I tried option 144 and the VVX merrily accepted it and moved to the voice subnet.  Soundpoints were also good using option 144.  But no dice for the VVX's if going back to option 128. 


Are there other settings that might explain this behavior?  Thanks for your time and comments!


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Polycom Employee & Community Manager

Re: VVX ignore DHCP option 128 but Soundpoint do not on the same LAN

Hello Cosmicsniper,

welcome to the Polycom Community.


Could you kindly post the whole software version as 5.4. is not the complete string. In additon did you ever have this working?

The community's VoIP FAQ contains this post here:

Jul 10, 2013 Question: How can I use VLAN's with Polycom phones?

Resolution: Please check => here <=


The above can be used to troubleshoot this.


I would suggest you raise a support ticket.

In order to raise a support ticket you need to work with your Polycom reseller as they need to do this for you.

If this is some sort of an Internet discounter please post your phone's MAC address so I can look up who would be able to support you.

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. All posts and words are my own & do not represent the views of Employer.


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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