using Modem to make n recieve call

m using suse 10.3 with a usb CDMA modem
it works well when i try to dial it to ISP to connect to internet
i use this wvdial.conf setting

[Dialer Defaults]
Modem = /dev/ttyACM0
Baud = 460800
Init1 = ATZ
#Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 This is autodetected
ISDN = 0
Modem Type = USB Modem
Stupid Mode=on
Dial Command=ATDT
Phone = #777
Username =internet
Password = internet

but my question is can i use this particular modem to make or recieve a call … (*nt voip or any ip based system… i mean using propper telephone line to do so)

if yes how?!?!?!

wht is this … no reply!!! yet … plz ppl i need help>:(