Fanvil phones audio is not loud enough

[Digital-Stewards]

Hi, I just replaced some Yealink phones with Fanvil phones and on the Yealinks the audio did not have to be at the maximum to be loud enough, but on the Fanvils the audio is maximized and it is only just enough and sometimes the customer really needs to listen very carefully or he doesn't hear/understand the person on the phone.

Is there a way to boost this?

 

[Alphabetic]

Are you connected via STUN by any chance?

 

[Digital-Stewards]

No, via SBC

 

[Alphabetic]

Latest FW and template?

I recall installing some X4 once upon a time and thought it was quiet.

 

[Digital-Stewards]

Yes, latest firmware and template, it just got installed this week. The devices are the X7C

 

[Alphabetic]

Is it quiet through loudspeaker too?

 

[Digital-Stewards]

On the speaker it is ok.
The client just replied and told me it was only on his phone and not with the other collegues.... So I guess it is just broken.

 

[Alphabetic]

Must be. Ask him to swap the curly cord and handset with another