Dialin problem

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Hi, if anyone has done dial-in service before 
i am having is that my modem does pick up the phone when i dial in, and the two modems establish a connection, but the OS does not do anything there is no login prompt, i was able to send data directly to the port and see it on the other computer with command:  echo "Hello" > /dec/cuaa0, Also i read that if getty completes the open port process then it changes from ?? in the PS screen to something it does not, so i am assuming that getty doesn't realize that the connection has been established, any ideas?