PPPD and internet connection

I am trying to get an internet connection using just pppd, and I have been successfully able to communicate with the modem.  When I run the pppd process ( pppd call script-name), it interacts with the modem and I obtain a ppp0 address (I verified this when I run the ifconfig command to see the network interfaces).  However, when I run a browser or try to telnet to the internet I can't get out.  Does anyone know how to get out just using the pppd command?  I have seen references to wvdial, kppp and other dial-up programs, do these programs do something additional that is not standard with ppp?

Thanks
Shannon

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