Thanks for the info. We're an MOH provider trying to help our client with their installation which is out of state. Their phone tech is in the hospital

It's a mono jack and a mono recording. I was thinking the MOH port in the phone system might be bad. You confirmed what I was already thinking.

Unless she finds another tech I'm guessing she'll need to get this resolved when her tech is out of the hospital.

Thanks for answering my post!