Phones Won't Re-Register Until DHCP Bindings Are Cleared

Occasional Visitor

Phones Won't Re-Register Until DHCP Bindings Are Cleared

I am experiencing an issue where every few months the Polycom phones will unregister. Rebooting resolves the issue for half of the phones, but the other half remain unregistered. Moving the phones to a port where another phone previously registered does not work. The phones are confirmed to get an IP address each time they reboot, but the phone icon still is hollowed out and incoming calls are received nor can outgoing calls be made. I can ping the IPs of the non-working phones successfully. The only way to re-register the other half is to either clear the DHCP bindings or to statically assign a different IP address.


The phones that we have on-site are IP 501s and the Soundstation 6000s. The phones get their DHCP from our DHCP server administered via Cisco.

The phones should all be on the firmware

I can still access the HTTP interface of the unregistered phones by entering in the IP address the phone has been assigned.


I am trying to figure out why I can access the phone on the HTTP interface and yet the phone is not registered as well as why the DHCP bindings need to be cleared for the phones to be able to re-register again.

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Polycom Employee & Community Manager

Re: Phones Won't Re-Register Until DHCP Bindings Are Cleared

Hello @workstation,

welcome to the Polycom Community.


The SoundPoint IP 501 was discontinued and was no longer available for purchase since 08/20/2009. Support for the product ended 08/20/2014. 


For the SoundStation IP 6000 the latest supported software is UC Software 4.0.14 and support is still available.

The community's VoIP FAQ contains this post here:

Oct 7, 2011 Question: How can I setup my Phone / Provisioning / Download / Upgrade / Update / Downgrade Software?
Resolution: Please check => here <=


I suggest you upgrade the SSIP6000 and then see if the issue still happens. The SPIP501 cannot easily be troubleshoot via Web Interface logs so see if you can get any details of the SSIP6000 once upgraded.


Oct 11, 2011 Question: How can I troubleshoot configuration Issues via Log Files or the phone GUI?

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


If official support is required please check how to phone or open a case here

The title Poly 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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