[Freeswitch-users] Is there a way for FS not to send back any response to INVITE

Hi, In order to protect against scanning attacks I'd like for FS to not respond to INVITES unless they match certain conditions. I understand that currently FS always responds with 100 Trying right away before processing the call and then, if the call does not match anything in the dialplan, responds with a 302 Moved Temporarily. The 302 can be replaced with another response code (for example 403 Forbidden which is what I am doing now) using the *respond* dialplan app. However, that might encourage the scanner to keep trying. So I guess there are two questions: 1. Is there a way not to send back 100 Trying at all? 2. Is there a way to not send any final response?