a few days ago I noticed that cisco released a FW update for the SPA525G phones. Until now I used the 7.4.9c FW that comes with the 8.6 UC560 software package. I uploaded the FW to our UC560 edited the load and updated the tftp config. After a reboot the phone just upgraded fine.
Since the upgrade I hear a strange crackling sound in my handset when I'm using the phone. The crackling appears like once every 60 seconds and lasts for 5-10 seconds. It sounds a bit like as if the other party would stutter or there was a "chopping" like effect applied to his/her voice. In Germany with analogue landlines we had some analogue call-charge pulse that sounded quite similiar :-).
I flashed the newer FW because I thought it might fix some compatibility issues with BT Headsets (I bought a Logitech H800 BT-Headset which pairs just fine with my laptop and iPhone but just won't work with my SPA525G2 using 7.4.9c and 7.5.2a-bt). The cisco SBS support told me that it's not in the compatibility list and they pretty much don't care about it.
So basically I wanted to ask if somebody else noticed the crackling within the 7.5.2a FW and / or has some adice on the Logitech BT issue?