trouble with Belkin F8T012V and sco

Hello,

using the Belkin F8T012V, a Broadcom based usb dongle, I have some trouble 
with sco. If I ring somebody or receive a sip call I can hear the caller but 
he only hears loud noise. This occurs not every time I use sip but very often 
and I noticed that this mostly happens after some time of no sip activity.

Could somebody please give me a hint if the Belkin dongle is supported by 
bluez or how I can debug this behaviour further? How can I figure out if this 
device is Broadcom Blutonium based?

I read that hciconfig hci0 revision should either print "SCO mapping: HCI" 
or "SCO mapping: PCM". Unfortunately my hciconfig hci revsion output looks 
like:

hci0:   Type: USB
        BD Address: 00:0A:3A:72:7B:C9 ACL MTU: 1017:8 SCO MTU: 64:8
        Firmware 7.67 / 14

I assume this is not a good sign, on the other hand I'm able to pair a headset 
with the dongle and e.g. obex ftp works.

Greetings
Jens

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