What’s worth bearing in mind is that prices vary based on user count. For anyone who wants to build their own PBX system and save lots of money in the process, it’s worth checking out Asterisk.

Why settle for an ancient, analog PBX? The best voice over IP (VoIP) services we've tested deliver enterprise-grade phone system features for a small-business-friendly price.

This guide was reviewed by a Business News Daily editor to ensure it provides comprehensive and accurate information to aid your buying decision. To determine which private branch exchange (PBX ...