Comment # 1 on bug 1184291 from Takashi Iwai

PA version on Leap 15.2 is way too old for fixing such an issue.  Leap 15.3
will be with the newer version and a backport patch set to support HFP native
backend, so it'll likely work better on your devices as well.

The update packages for Leap 15.2 are available also in OBS
home:tiwai:leap-15.2:update repo.