VoIP (Voice over Internet Protocol) technologies will help you reduce significantly your telephone cost.
Depending on your current system and internal infrastructure you may choose to keep your current phone system or to replace it with the latest in voice technology:

An IP Trunking Solution is a versatile and cost effective way to enjoy the benefits of VoIP while utilizing your existing legacy system and internal infrastructure. Voice and data, will no longer reside on separate networks, your connectivity simultaneously serves both your data and voice needs.

Hosted PBX Solution replaces your outdated phone systems or Centrix or Centranet lines with the latest in voice technology: Polycom phones, Broadsoft switch, the market leader, and Voice optimized Internet Access.