the 1004 Hz info is in the Fusion Voice FAQ (
https://wiki.sonic.net/wiki/Fusion_Voice_FAQ)
Star Codes
*67 Caller-ID blocking. Dial this code before your outbound call to disable caller ID for the next call. Please note that there will not be a dial tone after dialing *67; simply continue dialing. You can permanently block Caller-ID, see Voice Options for more information.
*69 Last Call Return. Will immediately dial back the last inbound caller if possible.
*72 Call-Forwarding, see Call Forwarding for more information.
*73 Disable Call-Forwarding.
*82 Disable Caller-ID Blocking. Will unblock outbound Caller-ID on your next call if it is blocked by default. Please note that there will not be a dial tone after dialing *82; simply continue dialing.
*99 accesses voicemail from your phone.
*272 turns on a high-pitched (1004 Hz) tone on your line.
*273 plays a read-back of your caller-ID information.
A quick Wiki edit can take that out : - )