Hello,
I try to play a short wav file, it works. But after on of the next tries the 
connection dies somehow with "Protocol error"
hcidump attached.
Thanks,
Frank

btsco v0.4a
Device is 1:0
Voice setting: 0x0060
RFCOMM channel 6 connected
recieved AT+VGS=9
Sending up speaker change 9
driver is in use
connected SCO channel
Done setting sco fd
speaker volume: 9 mic volume: 14
driver is not in use
disconnected SCO channel
speaker volume: 9 mic volume: 14
driver is in use
Can't connect SCO audio channel
: Protocol error
driver is in use
Can't connect SCO audio channel
: Connection timed out


config data:
Dell TrueMobile 350 in Latitude X1
Head set BT201 (noname)

Gentoo Kernel 2.6.11-gentoo-r9
btsco 0.4a (gentoo ebuild)
bluetooth-alsa 1.6-r2
bluez-libs 2.16-r1
bluez-utils 2.16-r1

lati btsco-0.4a # hciconfig -a
hci0:   Type: USB
        BD Address: 00:10:C6:XX:XX:XX ACL MTU: 384:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:146748 acl:19 sco:2845 events:89 errors:0
        TX bytes:145295 acl:19 sco:2829 commands:46 errors:0
        Features: 0xff 0xff 0x9f 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'BlueZ (0)'
        Class: 0x3e0100
        Service Classes: Networking, Rendering, Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 1.2 (0x2) HCI Rev: 0x679 LMP Ver: 1.2 (0x2) LMP Subver: 0x679
        Manufacturer: Cambridge Silicon Radio (10)


lati btsco-0.4a # hciconfig hci0 revision
hci0:   Type: USB
        BD Address: 00:10:C6:XX:XX:XX ACL MTU: 384:8 SCO MTU: 64:8
        Build 1657
        Chip version: BlueCore4-External
        Max key size: 128 bit
        SCO mapping:  HCI
        Panic code:   0x22


lati btsco-0.4a # hcitool info 00:0E:DA:XX:XX:XX
Requesting information ...
        BD Address:  00:0E:DA:XX:XX:XX
        Device Name: BT201
        LMP Version: 1.1 (0x1) LMP Subversion: 0xc70
        Manufacturer: Transilica, Inc. (24)
        Features: 0xbf 0xf8 0x31 0x00 0x00 0x00 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset>
                <timing accuracy> <role switch> <sniff mode> <SCO link>
                <HV2 packets> <HV3 packets> <u-law log> <A-law log> <CVSD>

lati btsco-0.4a # sdptool search --bdaddr 00:0E:DA:XX:XX:XX 0x1108
Class 0x1108
Searching for 0x1108 on 00:0E:DA:XX:XX:XX ...
Service Name: Headset
Service RecHandle: 0x20000
Service Class ID List:
  "Headset" (0x1108)
  "Generic Audio" (0x1203)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 6
Language Base Attr List:
  code_ISO639: 0x656e
  encoding:    0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Headset" (0x1108)
    Version: 0x0100