What You Will Learn
After reading this chapter, you should be able to
The transition from a traditional private branch exchange (PBX)-based telephony system to a Voice over IP (VoIP) system is not usually an overnight (or over-the-weekend for that matter) process. Instead, we usually take "baby steps," as they said in What About Bob? A first step might be to replace the trunk line that interconnects PBXs at remote sites with an IP wide area network (WAN) connection. A next step could be to connect existing analog phones, fax machines, and speaker phones to voice-enabled routers.
The end result of these baby steps is a telephony network, without a PBX, where voice traffic is transmitted over an IP network. In this chapter, we'll explore how to begin this migration and pave the pathway to a VoIP network.