headset not getting audio

I have a kensington usb bluetooth adapter 2.0 with a plantronics 510 headset. When a call is coming from asterisk (chan_bluetooth) with Dial(BLT/PLANTRONICS-HS) my headset hears the ringing. I press my answer call button and I get NO audio... I see below there is an error

process_rfcomm_cmd: Unknown AT Command: 'AT+VGM=15' (+VGM=15)

What do I do???

Thanks,

Jerry

------------------------

[HS] PLANTRONICS-HS < +CIND: ("service",(0,1)),("call",(0,1)), ("callsetup",(0-4))
[HS] PLANTRONICS-HS < OK
[HS] PLANTRONICS-HS > AT+CIND?
[HS] PLANTRONICS-HS < +CIND: 1,0,0
[HS] PLANTRONICS-HS < OK
[HS] PLANTRONICS-HS > AT+CMER=3, 0, 0, 1
[HS] PLANTRONICS-HS < OK
[HS] PLANTRONICS-HS > AT+VGS=00
[HS] PLANTRONICS-HS < OK

*CLI> bluetooth show peers
BDAddr Name Role Status A/C SCOCon/Fd/Th Sig
----------------- ---------- ---- ----------- --- ------------ ---
00:03:89:53:FD:3A PLANTRONICS-HS HS Ready Yes -1/-1/0 N/A
-- Accepting UNAUTHENTICATED call from 192.168.1.10:
> requested format = gsm,
> requested prefs = (gsm),
> actual format = gsm,
> host prefs = (gsm),
> priority = mine
-- Executing Dial("IAX2/192.168.1.10:4569-1", "BLT/PLANTRONICS-HS")
in new stack
[HS] PLANTRONICS-HS < +CIEV: 3,1
[HS] PLANTRONICS-HS < RING
-- Called PLANTRONICS-HS
-- BLT/PLANTRONICS-HS is ringing
[HS] PLANTRONICS-HS > ATA
[HS] PLANTRONICS-HS < +CIEV: 2,1
[HS] PLANTRONICS-HS < +CIEV: 3,0
[HS] PLANTRONICS-HS < OK
-- BLT/PLANTRONICS-HS answered IAX2/192.168.1.10:4569-1

Dec  6 09:10:18 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:621
sco_thread: SCO thread started on f d 33, pid 3721
[HS] PLANTRONICS-HS > AT+VGM=15
Dec  6 09:10:19 WARNING[3736]: chan_bluetooth/chan_bluetooth.c:2381
process_rfcomm_cmd: Unknown AT Command: 'AT+VGM=15' (+VGM=15)
[HS] PLANTRONICS-HS < ERROR
Dec  6 09:10:19 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:685
sco_thread: Wrote <48 to sco
Dec  6 09:10:19 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:685
sco_thread: Wrote <48 to sco
Dec  6 09:10:19 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:685
sco_thread: Wrote <48 to sco
Dec  6 09:10:19 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:685
sco_thread: Wrote <48 to sco
Dec  6 09:10:19 WARNING[3747]: chan_bluetooth/chan_bluetooth.c:685

sco_thread: Wrote <48 to sco

Jerry Geis
MessageNet Systems
101 East Carmel Dr. Suite 105
Carmel, IN 46032
(317)566-1677
(317)663-0808 Fax