asterisk users - Apr 2012 - chan_mobile with Nokia 6021 - incoming SMS causes call to drop

Hello,

I'm Using Asterisk 1.8.11.0 on Debian Squeeze.  I was experiencing problems
with ${SMSSRC} being blank, so I applied this patch:
https://issues.asterisk.org/jira/secure/attachment/42026/sms-sender-fix.diff but
otherwise everything is standard.

As the subject says, if I am making a call through the phone when an SMS is
received, the bluetooth connection drops and the call ends.  The SMS is
delivered successfully.

This happens on two different 6021 handsets, one is connected to a DBT-120 (csr)
dongle and the other is connected to a no-name btusb dongle.  Nothing unexpected
shows up in the Asterisk console:

    -- Executing [*00 at house-phones:4] Dial("SIP/200-00000037",
"MOBILE/JS6021/4444,60,rTK") in new stack
    -- Called MOBILE/JS6021/4444
[2012-04-30 19:13:15] WARNING[25326]: channel.c:4913 ast_write: Codec mismatch
on channel Mobile/JS6021-6e5b setting write format to alaw from slin native
formats 0x40 (slin)
    -- Mobile/JS6021-6e5b is making progress passing it to SIP/200-00000037
    -- Mobile/JS6021-6e5b answered SIP/200-00000037
    -- Executing [sms at from-stocksy-orange:1]
Verbose("Mobile/JS6021-b05c", "Incoming SMS from
<numberremoved> <message>
") in new stack
Incoming SMS from <numberremoved> <message>

    -- Executing [sms at from-stocksy-orange:2]
System("Mobile/JS6021-b05c", "echo "To: mymail" >
/tmp/smsmail-stocksy") in new stack
    -- Executing [sms at from-stocksy-orange:3]
System("Mobile/JS6021-b05c", "echo "Subject: SMS from
<numberremoved>" >> /tmp/smsmail-stocksy") in new stack
    -- Executing [sms at from-stocksy-orange:4]
System("Mobile/JS6021-b05c", "echo "<message>
" >> /tmp/smsmail-stocksy") in new stack
    -- Executing [sms at from-stocksy-orange:5]
System("Mobile/JS6021-b05c", "sendmail -t -f
<numberremoved>@sms.stocksy.co.uk < /tmp/smsmail-stocksy") in new
stack
    -- Executing [sms at from-stocksy-orange:6]
Hangup("Mobile/JS6021-b05c", "") in new stack
  == Spawn extension (from-stocksy-orange, sms, 6) exited non-zero on
'Mobile/JS6021-b05c'
    -- Bluetooth Device JS6021 has disconnected.

I do get some messages in syslog at this time, I don't know if they are
significant:

Apr 30 19:13:19 pabx kernel: [696331.658348] btusb_isoc_complete: hci1 corrupted
SCO packet
Apr 30 19:13:19 pabx kernel: [696331.658394] hci_scodata_packet: hci1 SCO packet
for unknown connection handle 0

I have (I think!) loaded btusb with force_scofix by creating this file:

# more /etc/modprobe.d/btusb.conf 
options btusb force_scofix=1

and reloading the btusb module.

Is this a known problem?

Regards,
James.
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