Cannot call from 3CX phone to cell phone

[RDWild]

I have a situation where if someone calls from a 3CX phone, to a cell phone number, the phone rings, the user answers, but neither end can hear anything. Calls from the cell phone to the 3CX phone are fine. Cell phones with the 3CX app are fine.
We have tested with different carriers, and in range of different cell towers.

 

[RDWild]

Cell provider? We have tested with Cellcom, Verizon, AT&T. We have tried these phones on the local tower as well as towers in different cities. I really don't know what to make of it at this point.

 

[TheodorosG_3CX]

You may also create a ticket to the 3CX Technical Support to investigate further.

 

[RDWild]

Thank you. I may do that.

 

[RDWild]

Fanvil provided me with an updated firmware and instructions to install locally via flash drive. This has resolved our issue.

 

[TheodorosG_3CX]

Can you please let us know what was the exact issue and which firmware was provided?

 

[RDWild]

The firmware provided was 2.12.16.22. Evidently the phones were far enough back, that you could not update the firmware via the 3CX console, nor from the phone's webpage. They gave me instructions to put it on a flash drive and update from POST.

 

[TheodorosG_3CX]

This is the correct firmware. Since there were updates missing which Fanvil indicated, it might required some other steps to follow.
Keep in mind though that this is upon each vendor and if there issue with firmware updates you should contact them for further clarification.