We had a Sangoma S500 telephone in a small conference room. We always had a hard time hearing the caller when we were on speaker phone. We purchased a yealink conference telephone. We still find that the call volume is low (even on max volume). The system is a FreePBX 60 with a 4 port FXO card (a200 I believe) with echo cancellation built in. I know that I can change the settings for the receive gain under dahdi config however I am not sure what I should change it to.
any help would be great