Ok, I know this is not a Grandstream forum, but seems like there are a tremendious amount of experts on that particular phone here, so allow me to ask: Is it possible to change the dial-tone when lifting the handle on the Grandstream phones -I get a nice American dial-tone and though it is not a showstopper, I would like to get a copy of the local dialtone (440Hz). K.Rgds Jens P. Hansen