Voicemail. You only get 1 inbox, sorry. As for message waiting, well there are 2 ways you can be notified (3 if you have the v-tech but you don't so...) First is the blue light on the router will flash if you have a waiting VM but if you're like me and have the router in a diff room then your dial tone will tell you. You'll get a stuttered dial tone if you have a message, call 123 and you'll get it
As for the call waiting, can't remember offhand but it's the same as the cellphone one to set it up, you'll get a beep notifying you if/when you have another call coming in.