Nokia BH-503 Bluetooth Headphones and Nokia SIP client echo

I have been playing with the Nokia BH-503 Bluetooth Stereo headphones for the past couple of days. I've got to say that overall they are great and a far cry from the Sony Ericsson HBH-65 which I have in my desk drawer, decommisioned very shortly after it was purchased several years ago.

The Nokia headphones sound great, are comfortable, and Bluetooth seems to work OK 90% of the time. There is the odd crackle and pop when on a phone call, music occasionally stops momentarily for no apparent reason but overall they're great. Yesterday I listened to 3 45 minute-ish Podcasts and 4 or 5 music albums and for a good deal of that time they worked flawlessly.

Unfortunately I have found a couple of problems with the Nokia SIP client/ Bluetooth combination.

1) The call button can not be used to answer an incoming VoIP call. It works fine with a cellular call but not with SIP. This seems to be a known issue.

2) The other party hears a very prominent echo of their own voice when on a VoIP call. Again this doesn't happen with a cellular call.

I've mentioned it this thread on the N95 website http://www.n95users.com/forum/connectivity/5359-bluetooth-over-sip-client.html

I really hope Nokia fix this in the new firmware versions of the SIP client as it is a big issue for me.

Please let me know if you have the same issue, or even better, if you don't have this issue but you use a bluetooth headset and the Nokia SIP client.