Adjusting the volume
There are cases when a customer can be heard very quietly during a phone call and there is no way to increase the volume level on the telephone /softphone. Let's describe a way that can help in solving the problem:
Go to "System" -> "System file customization"

Open modules.conf for editing

Add to the end of the file
load => func_volume.so
Save the changes

Open the extensions.conf file for editing

Add the following code to the end of the file:
[all_peers-custom]
exten => _X!,1,Set(__DYNAMIC_FEATURES=vUp#vDown)
same => n,Set(VOLUME(TX)=5)
same => n,Set(VOLUME(RX)=5)
same => n,return
[add-trim-prefix-clid-custom]
exten => _.X!,1,Set(__DYNAMIC_FEATURES=vUp#vDown)
same => n,Set(VOLUME(TX)=5)
same => n,Set(VOLUME(RX)=5)
same => n,return
[volume-level-control]
exten => up,1,NoOp()
same => n,ExecIf($[ "${Vol}x" == "x" ]?Set(Vol=0)
same => n,Set(Vol=$[${Vol}+5])
same => n,Set(VOLUME(TX)=${Vol})
same => n,return
exten => down,1,NoOp()
same => n,ExecIf($[ "${Vol}x" == "x" ]?Set(Vol=0)
same => n,Set(Vol=$[${Vol}-5])
same => n,Set(VOLUME(TX)=${Vol})
same => n,return
Save the changes.

Open the features.conf file for editing

Add the following code to the end of the file:
[applicationmap](+)
vUp => #1,self,Gosub,"volume-level-control,up,1"
vDown => #0,self,Gosub,"volume-level-control,down,1"
Save the changes

The default volume will be higher, the value is 5 instead of 0. If desired, the employee can dial #1 to increase the volume or #0 to decrease
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