Cisco IP phones with bluetooth

Doing some research at work, I found the following Cisco IP phones (office phones, not home phones) have built in bluetooth for use with a headset. If you have a hearing aid bluetooth device you should be able to pair with these phones.

9971
8945
SPA525G, also comes as a SPA525G2
7925G

When I was trying Phonak aids, I tried an older iCom Bluetooth paired to a Cisco 9951 phone on a conference call in a quiet office.

From my perspective, it worked quite well. From the perspective of coworkers who were also on the call, I was louder than other people on the call. We expect that was probably an issue with the conference bridge and not my phone setup.