I'd also like something like background ambient noise. Kinda hard to lie to your girlfriend about not being in a strip club if the music can be heard on the background, like a yell or a shot or a loud noise.
I don't know about the ambient noise but I noticed that ambient noise does not filter through phones. However, loud noises already do go throughome to the listener.
Yells, shots, knocks on doors, those already can be heard on the other end of the phone.
I think someone talking though should get through. Sometimes you're on the phone and you can hear some things that are happening on the other end. Somebody else talking. I think it would be interesting and develop some RP if someone ( Joe )is talking to Character A (Bill) and the person on the other end of Bill's call makes out some of it, like what happens when you overhear a whisper.
Bill is talking to Peter on the phone and knocks on Joe's door. Peter hears the knock.
Peter then hears muffled voices and hears something unintelligible.
Peter then hears something unintelligible.
Peter hears, "..d .he. .he ...t .. th. .MB w..h .h. pi.p b...."
Or maybe someone with heightened hearing could focus and get part of the other side if theyes are nearby and focus? They'd have to have one or two other modules though.