I’m working with a company to replace all their desk phones and we are trying out some S500’s but the volume on the handset is really loud and even distorted. This occurs on the DTMF feedback, dialing and remote audio. Even with the volume adjust set all the way down to the 1, the lowest it will go, the volume is still too loud to be comfortable. The web GUI has a volume amplification section and a handset send volume but even with that set to -6, the issue persist.
Attached to PBX Firmware:
PBX Service Pack: