Yealink Phones are unregistered in a random way for exactly 24 hours

[CloudT]

Hi,
I have 5 YEALINK T42S and two W60B with 1 DECT connected on a first Base and 3 DECT connected on a second Base. ALL the Phones are working correctly for several days and suddenly, then they are unregistered one after the other. They are no more registered.
And each time, after exactly 24 hours, they register themselves and everything is fine again.

All Firmwares are up-to-date, 3CX Version 15.5 with the latest updates.
I have no IP address blocked, I added the IP address of the Trunk SIP and the local WAN IP in the whitelist.

3CX is deployed and hosted on a VM (Virtual Machine VMWare) from Trunk SIP Provider.

Since February 2018, it's been four times since this problem arose. All phones are no longer registered. But Softphones on PC's and Android or IOS smartphones continue to work, the extensions are still registered. The extensions configured on the SIP Phones are no more connected.

I really need your help. I do not really understand where the problem comes from.

Thanks for your answers.

 

[jonathanv]

What about Security > Trusted Certicates > " Only Accept Trusted Certificates " in the Yealink's web interface, should they be enabled ?
Actually for the five T42s it's enabled but not for the 2 W60B DECT Base.

Nope we just changed setting on 3cx server, not on phones directly

 

[CloudT]

Many thanks Jonathan for your helps.
I will continue searching next time when the issue occurs again.
But I still not understang why it was working fine for 15 days before being unregistered.

 

[YiannisH_3CX]

Shall I launch the pcap feature for 5 min on all the phones or only one is sufficient ?
And how to read a .pcap log after exporting the file ?

Since the issue happens to all phones the behaviour should be the same. So only one phone will be fine.
Once you have the files send me a p.m. and we can look at the captures together.

 

[CloudT]

Hello,
It's happened again today 24/04/2018 12:25.
How canI send .pcap files as a p.m ?
Thanks

 

[YiannisH_3CX]

Please check your inbox

 

[YiannisH_3CX]

I have already sent you a private message. Check your Inbox on the top right of the page