need help for modem

[Prahmod]

i have a working external modem.it works fine with ubuntu.but my problem
is i have a internal pci modem.the good news is it is detected but does 
not work fine. present wvdial.conf is setup with
the following codes which generates the following error.the modem just hangs up and 
it even does not get dialed but when i try the command:
sudo wvdialconf /etc/wvdial.conf
it says the modem is /dev/ttySL0 and i think the wvdial.conf is rightly configured.what might be the 
problem?????


#present /etc/wvdial.conf contents
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Phone = 15000
Modem = /dev/ttySL0
Username = prahmod
Carrier check = no
Password = prahmod
Baud = 115200



#while trying the command:sudo wvdial it always generates the following results:
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT15000
--> Waiting for carrier.
ATDT15000
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
--> Timed out while dialing.  Trying again.
--> Sending: ATDT15000
--> Waiting for carrier.
and it goes on  and on............



please guys help me with my modem.and please do add me in the cc while
mailing as i am having problem with the ubuntu mailing list.thank you in
advance.and also wish u all a HAPPY DASHAIN...............

-- 
                lastly "SAY YES TO LINUX"

                        Prahmod