I was recently using the LAB-XT experimenter board found in my university lab for one of my final year project. (online schematic: http://melabs.com/downloads/LABXTSCH.PDF)
Everything works fine except the volume from the other side of the line is very soft while the input from the Mic is very loud. Unfortunately I am not too familiar with the opamp there.

i have been staring at the "Co Line Audio Amp" and wondering if there is anything I could replace there to boost the volume from the phone line without boosting the microphone locally?

Hope someone could suggest something I could try out.

Thank you in advance....