The Bell Aliant Unified Communications VVX 500 has 12 lines, and you can conference in 6 people (5 others and yourself). The Bell Aliant Unified Communications VVX 600 has 16 lines, and can also conference in 6 people (5 others and yourself).
To place and answer your calls, you can use one of the following:
Press the headset button to use a connected headset.
Press the speakerphone button to use the speakerphone.
To change to the handset, pick the handset up.