You can setup an OGM which is set to leave a message in a specific mailbox based upon which button is pressed. Unfortuantely, there are only a limited number of keypad buttons available and if there are many users to choose from you could use an approach like this: Setup a "next page" method, where if the user doesn't want to leave a message for the people listed in that OGM, they can opt to select a next page option and hear a new list of people to choose from. If you simply do not want the call to go to a voicemail box, open the default OGM and instead of having "Leave message [...]" change the setting to something like Goodbye/hangup