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I am trying to use this phone with 3CX.  The function that is described in the manual that I really would like to have is the ability to have more than a 3 way conference call set up at the phone.  The manual says I should be able to setup a conference call, put that call on hold and start another call.  Once that call is set, I should be able to join that call to the previous conference call and add that person.  I get an error where I try, "Service Unavailable".  3CX says the phone can only handle a 3 way call.  Does anyone know if there is something I can do to make this work?





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Polycom Employee & Community Manager

Re: VVX500 maximum number of conference participants

Hello Chris,

welcome to the Polycom Community.

The Community VoIP FAQ holds this post:


Oct 25, 2011 Question: What is the maximum amount of participants in a conference call?

Resolution: Please check => here <=


Looking in addition at the latest UCS 4.1.0 Admin Guide page 144:


The SoundPoint IP 321, 331, and 335, SoundStation IP phones, and VVX 500 phones support three-way local conferencing.

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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