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I think he's asking for the default 300 series extension for the built in modem which for example is 3999 on a 500 system. If its an external modem then its connected through a sli port and there is no "default" extension number.You would have to look up the extension number of the port it's connected to.
[This message has been edited by pvj (edited December 12, 2004).]
If you are going to use an external modem, make sure that it is a controller based modem. Samsung Tech support should have the modem configuration for the US Robotics modem.