Asterisk GUI ... Routing internal Calls

I have installed Asterisk-GUI on a pre-installed and pre-configured asterisk box and am unable to call between internal extensions. The configuration files that Asterisk-GUI picks up by default are the ones which i manually added but the extensions that i have added with the help of the GUI are no where in the configuration files. Kindly tell me what is needed to make internal extensions call each other.

I have also made a default dialplan and have assigned all the local extensions to it.