What Is a Dial Plan?
So what is a dial plan? A dial plan is, in its most basic form, a system interface for
telephony devices that allows users and equipment to connect to each other by
using dialing strings.These dial strings can be mapped and routed to a multitude
of locations by the controlling system.Think about it like this: a dial plan is an
internal address you can route to in order to get from point A to point B.
Without a dial plan, your telephony device would not be able to connect to
another (granted, this might happen anyway, but you want to give yourself at least
a shot). A dial plan is an integral part of the puzzle and gives your users the flexibility
and services not normally associated with a standard PBX.match dial peers.When a call is arriving on a POTS port, the router will
match the VoIP dial peer for the outbound call. Conversely, this is also true when
calls come to the router from an IP network.The router will match both the
POTS peer (for call termination) and the VoIP peer to utilize AVVID bandwidth
features like Voice Activity Detection (VAD).This can be easily translated into
flow chart form like that shown in Figure 9.1.