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CX500 No dial tone

Occasional Visitor

CX500 No dial tone



I have 2 CX500 phones that when you pick up the handset has no dial tone. The speakers comes on and has a dial tone but when you pick up headset you hear the dial  tone for like 1 second and back to no dial tone. I replaced the phone for another I know to be working and it works fine. But these 2 in particular have this issue. Does something need to be updated on these phones? 


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Polycom Employee & Community Manager

Re: CX500 No dial tone

Hello bjend,

welcome to the Polycom Community.

In order to resolve this issue I suggest to contact Polycom support directly or work with your Polycom reseller.

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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