The 308 is a cost effective, yet sophisticated office phone system. Norstar Compact 3x8 systems are designed specifically for small businesses and voicemail can be added at anytime:

This is a 3 line, 8 telephone station PBX designed for smaller business operations that need a system for optimal functioning, but do not need expandability that come with bigger system.

It's easy to add the options that your business needs, including Norstar applications, automated attendant, analog terminal adapters, and station message detail recording (SMDR).