Cannot Download Remote Phonebook

[dreid]

One of our clients reported that whenever they try to access or update their 3CX phonebook on their desk phones, they get an error message saying "Cannot Download Remote Phonebook!".
They are using Yealink T29Gs, which I understand are no longer supported so issues are bound to crop up, however, we are seeing the same issue on our phones.

We have some T29Gs, but we also have T46S and T54W phones here as well, and this feature does not seem to be working on any of them.
We only noticed this a few days ago when it was reported by one of our clients, so we do not know exactly how long this has not been working.
The phonebooks are pushed out via auto provision links.

Any help would be much appreciated.

 

[JohnS_3CX]

Hello,

Let's start with a specific customer first. Read the below and provide more info:

https://www.3cx.com/community/threads/post-in-relevant-category.115838/

 

[Matt_AIT]

We have just had a customer with a T42G report this on their phones too.
3CX: 18.0 (Build 418)
OS: Debian
Azure hosted
SBC and STUN

 

[JohnS_3CX]

We have just had a customer with a T42G report this on their phones too.
3CX: 18.0 (Build 418)
OS: Debian
Azure hosted
SBC and STUN

On Update 5 we increased the security requirements. Some EOL phones do not support modern TLS ciphers, meaning they can no longer connect securely to the PBX and download their config/phonebook.

This will eventually happen to more and more EOL devices (since software moves ahead in dev, but older firmware does not keep up with the times).

You can reduce your security (untick below) and allow them to connect, but this is a choice you will have to weigh against the security risks it brings.