I have connected Sportster modems to Cisco routers in the past and had good success. I saw detailed config suggestions from lrmoore and others for the old 33.6 models as answers to previous questions. I have change DIP switch settings and tried some AT commands on the modem. I have also tried customizing the Stopbits and other modem specific features on the AUX port. I am trying to dial in from Hyperterminal under Windows XP. When I first set this up I could connect to the modem but never got a Login to the Router. After making more changes I have had difficults even get past the handshake and get a connection.