Cannot Register ANY Phones

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healthy

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We have been running our local 3CX instance for a number of years. Recently we needed to add new phones, but have been unable to do so.... I have gone as far as setting up a new 3CX Server to rule out a configuration issue, but it appears that there's something that I'm missing as both refuse to register...

It's a simple network, originally separated subnets - 1 for PCs and Servers (50 or so) and 1 subnet with PoE switch just for phones connected to our router with a VM and the 3CX Windows Server running on it. (10 phones). Now, I have even simplified and moved everything onto the same network segment, yet I don't see a single phone listed. I have factory reset and am unable to see any phones at all.

I added a dns zone for our 3cx.us FQDN address that points to the internal LAN IP of the 3CX Server but that hasn't helped any either.

Any help would be most appreciated
 
Im wondering if this is your cause

View attachment 14742
Looks like that was it. I just logged into both switches and turned off any kind of multicast filtering / snooping and one of my factory reset phones just showed up ready for configuration!

Thank you all for your help... I am so psyched to be able to get our 3CX back up and running!
 
Perfect!
Time to break it with VLANs :p
 
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