weell,
go to the properties of ur connexion and then click on the calling rules,
now click on ur location and enter the correct country a.k.a india for direct dial and then in the general tab, there will be an option for setting pulse/tone, jus choose and then comeback and reset ur location on the props window as India and then connect...
If that doesnt work do this :
in the modem props's advanced tab/button and in the extra initialization field type "ATDP"