Solved New phones not appearing under "Phones"

[ESA-AT]

3CX Version: 18.0 Update 7 (Build 312)
OS: Windows 10 Enterprise LTSC 21H2
Phones in use: Yealink T43U & T46U

We recently switched hardware without major complications. Provisioned phones are working like intended but new Phones are not showing up. Not sure if it has anything to do with the switch.
I've followed some troubleshooting steps including these: https://www.3cx.com/community/threads/new-phones-on-lan-not-showing-on-phones-page.87334/post-413359
I was able to locate the entry with Destination IP=224.0.1.75.

 

[JohnS_3CX]

This comes down to 2 things usually

1. Check that the phone IPs have note been blacklisted and then factory reset the phone (because if so, the entries will not be shown)

2. Ensure that 3CX can actually receive the message on 224.0.1.75 so it can show it in the first place. The switch could also be blocking it (we have seen this many times before on managed switches).

Do you have more than 1 NIC on your machine and are you using RFC1918 compliant addressing?

 

[ESA-AT]

1. The phone IPs have not been blacklisted, I checked multiple times after and before resetting the phones.

2. I already did this, as previously mentioned. The message to 224.0.1.75 was received as confirmed via Wireshark.

Only 1 NIC and yes, we are using private address ranges.

 

[JohnS_3CX]

You should be able to see some updates on your system - apply them until you reach version 18.0.7.441 and then try resetting a phone again.

 

[ESA-AT]

The only Update I can currently select is the Alpha Update 18.0.7.424.
Current Installed Version is 18.0.7.312.

 

[JohnS_3CX]

Yes, once updated you will see the next one

 

[ESA-AT]

Just did the Alpha and Beta Updates. It now works.Thanks for the support.

 

[JohnS_3CX]

Excellent news, glad to help.