Asterisk-Users, Is anyone out there using the SPA-1001 for integrating existing analog phones into a VoIP setup? My question has to do with the MWI. From the datasheet it says that it provides MWI Tones, and then that it provides Visual MWL "via FSK". What does "via FSK" mean? My exsting phone has an answering machine built in and I am debating using Asterisk as the Voicemail, or just the exsting answering machine. Any comments or insight into the SPA-1001 would be appreciated. Thanks, Ryan