Thanks in advance for any help\suggestions! Issue: The incoming call audio from both internal and external calls is much lower than the audio from other applications running on client computers. External call participants can hear those of us using the 3CX client without issue, however, it is quite difficult for those of using the 3CX client to hear the other participant, across the board, regardless of where they are calling from. The speaker audio device has to be turned up to maximum volume on the client machine in order to hear the other call participant. Implementation Overview: PBX: 3CX V15.5 running on Windows Server 2016 Virtual Machine hosted on hardware in a data center Phones: 3CX Windows Client V15.5 Softphone running primarily on Windows 10 x64 bit machines SIP Trunk Configuration: Advanced: PBX Delivers Audio is checked. No other options checked Codec Priority: G.711 U-law - No other codecs in use Other Notes: 50+ softphone instances in use in 5+ office locations serviced by different ISPs, the issue affects all instances Have checked the Windows Volume Mixer to make sure that the 3CX Windows Client isn't specifically turned down. The PBX used to be installed on a bare metal Windows 7 machine located in one of the office locations and the issue occurred then in all locations as well. The PBX configuration was backed up and migrated to the Server 2016 VM and is now using different SIP trunks as well. Please let me know if I can provide additional information to assist in troubleshooting this issue. Thanks!