Ip office 9.1 with vmpro conf mm
 

Conference bridge users are complaining about muffled audio during calls,they only have a pri on the system.....anything we can check in configuration?

that may be a ussing problem .
all the member of conf call should on mute rather than the speaker.

thanks, would you clarify your suggestion please?
are you saying all callers should be on mute unless they are speaking?
I appreciate your response.

also, additional gain on the pri channels was detrimental to functionality of dtmf tones

yes , you are right "callers should be on mute unless they are speaking".