Hey Nokia Gurus,

I'm trying to establish a concurrent data and voice call with a 3G (UMTS) phone.

I've managed to establish a data call via Bluez/rfcomm/pppd on Linux and I get decent download rates (40KB/s) - hence 3G data is working.

While the download is in progress I pickup the phone and dial a number. As soon as the phone rings the download stalls. If I cancel the call the download continues.

My understanding is that concurrent voice/data is NOT possible with GPRS but IS possible with 3G/UMTS and the Nokia 6680. Is that correct and if so is there a special AT command that I have to send to the phone when setting up the data call to permit a concurrent voice call?

Any help is highly appreciated.