Maybe I’m missing something, and although I don’t wear Phonak aids, I thought that while you’re streaming content for phone calls or music or videos, you should be able to just manually mute the mics on the hearing aids so that it doesn’t pick up any environmental noise around you and mix it in with the streaming audio, no? Then all you would be hearing is your caller’s voice and nothing going on around you.
Or are you talking about the background noise on the other end of the phone call where your caller 's microphone picks up the noise around him/her on their end? If that’s the case, then it’s really up to your caller’s microphone circuitries to filter out their background noise and emphasize their voice over their background. There’s really not much you can do on your end because the streaming audio content is what it is.