I have the Handset BH-106 which was working fine with my old Nokia Phones, after i got the Lumia 920 i Found that the Audio became very low after start the Call, it will start good but dropping down with the time, it was very old so i decided to buy i new one and i have selected the BH-217.
i have tested it in the store the Audio was perfect, after few days the same issue accure and now im sure its the Phone issue not the Handset.
i did soo many soft/Hard Resets, i also got the Portico update, and i got other nokia Update (like Audio and others) but nothing worked.
is it really the Phone Issue because i dont want to buy newer handset like BH-220 with no benifits !
what is the soulution and what is the best Audio Hanset (for phone calls only i dont listen to music), which is have a car base like the BH-217 and can go to stand-by Mode.
It seems like this is a common problem with the BH-217 and it's auto adjust volume. You should be able to adjust volume on the phone.
Others have the same problem.
Any bluetooth headset should work for you.