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
