Leave a Msg use case (cont.)

4. Connection asks Telephone to play greeting
5. User speaks the msg:
   • Telephone asks Connection to record it
   • Add "record voice input" responsibility to Connection
6. User hangs up:
   • Telephone notifies Connection
7. Connection wraps the msg in a Message object
   • Add Message as a collaborator of Connection
   • Make a Message card with responsibility "manage msg contents"
8. The Connection adds the Message object to MailBox