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Alarm Fails - USB 3g modem

Hello All,

                 I am using AM33x and i am trying to connect usb 3g modem on android :

Check list :

i followed the ti-ics porting guide and i  checked 

1.the kernel configuration is done...

2.file system changes 

3.Mode switch succeed as

[ 49.892272] usb 1-1: new high-speed USB device number 3 using musb-hdrc 
[ 50.034149] usb 1-1: New USB device found, idVendor=12d1, idProduct=1436 
[ 50.041168] usb 1-1: New USB device strings: Mfr=4, Product=3, SerialNumber=0
[ 50.048614] usb 1-1: Product: HUAWEI Mobile 
[ 50.053009] usb 1-1: Manufacturer: HUAWEI Technology 
[ 50.064086] option 1-1:1.0: GSM modem (1-port) converter detected 
[ 50.070983] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0 
[ 50.083801] cdc_ether 1-1:1.1: wwan0: register 'cdc_ether' at usb-musb-hdrc.0
[ 50.099731] option 1-1:1.3: GSM modem (1-port) converter detected 
[ 50.106597] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1 
[ 50.115081] option 1-1:1.4: GSM modem (1-port) converter detected 
[ 50.121826] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2

when i type the below command

/system/bin/pppd /dev/ttyUSB0 115200 persist defaultroute usepeerdns updetach crtscts noauth debug connect "/system/xbin/chat -v -s -f /system/etc/ppp/airtel.chat"

it throws me like this

timeout set to 10 seconds 
abort on (BUSY) 
abort on (NOANSWER) 
abort on (ERROR) 
StartingGPRSconnectscript 
send (ATZ^M) 
SettingAPN 
expect (OK) 
^M 
OK 
-- got it 

send (AT+CGDCONT=1,"IP","airtelgprs.com"^M) 
abort on (NOCARRIER) 
Dialing... 
expect (OK) 
^M 
AT+CGDCONT=1,"IP","airtelgprs.com"^M^M 
OK 
-- got it 

send (ATD*99***1#^M) 
expect (CONNECT'') 
^M 
ATD*99***1#^M^M 
NO CARRIER^M 
^M 
^BOOT:1141512,0,0,0,20^M 
alarm 
Failed

my airtel.chat is like this:

TIMEOUT 10
ABORT 'BUSY'
ABORT 'NOANSWER'
ABORT 'ERROR'
SAY 'StartingGPRSconnectscript\n'
""'ATZ'
SAY 'SettingAPN\n'
OK 'AT+CGDCONT=1,"IP","airtelgprs.com"'
ABORT 'NOCARRIER'
SAY 'Dialing...\n'
OK 'ATD*99***1#'
CONNECT''

 My usb 3g works properly with my pc. But fails in android. I need the reason for  the alarm fail.

                                                                        Thanks in advance.