Can I configure the tone for busy? Suppose that we call between an MVP110 and Netmeeting and Netmeeting disconnects the call. In that case, which tone will we hear in the analog phone connected to MVP110?

To change the busy tone you hear when Netmeeting hangs up, you need to adjust the Regional settings in the MultiVOIP's Configuration software. When in the configuration software, click on Voice Channels | Regional. Set the Country field to "Custom" and then click the "Custom" button. From the Tone Pair dropdown box select "Busy Tone". By default the busy tone alternates repeatedly between being ON for 500ms and OFF for 500 ms. You can adjust periods of the Busy Tone if you so desire.