Volume to low on calls

Hello all,

I’m having a problem when I have a phone call come in to the system if it goes to a sip phone it is fine but if it goes to a phone on an FXS card on the TDM400 or if it is forwarded back out to a cell phone it is really hard to hear the called.
I’m using freepbx 2.2.3 with asterisk 1.2.23 and a TDM400 with 1 FXS and 3 FXO cards.

Any ideas would be greatly appreciated