3CX and FW .130 low mic volume

[Alexander2]

Hello,
we have a 3CX and we are using the provisioning template of version 15 to deploy Yealink phones. The customers alway say "can you please speak louder" ...i have found this information in the internet:

#Configure the sending volume of Speaker, Handset and Headset. It ranges from 1 to 53, the default values are 25, 35, 29.
#Require reboot;
voice.handfree_send = 25
voice.handset_send = 35
voice.headset_send = 29

But the template of the 3CX does not contain any parameter with "_send" .... which paramter we have to change to set the voice level on the mics higher?!