The 1032 phone allows you to customize the "line" buttons (the soft keys to the right of the screen) to dial out on each of your SIP registrations. There are a total of 12 positions (4 at a time, scrolled through by pressing a key). So, in that sense, it's just like any multi-line phone.
Of course, it will also show you which line is being called, so you can answer each one with the appropriate greeting (Hello, Clive's Chives, or, Hello, Clive's Car Cleaning)...