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How Does Local Routing Work?

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December 17, 2012

How Does Local Routing Work?

By Rich Steeves, TMCnet Managing Editor


There are a lot of terms thrown around the telecom space, many of which are quite confusing. Knowing what terms like “least cost routing” and “local routing” are can help companies better navigate this complex space. Let’s take a look at one of these terms right now and get to the bottom of local routing.


Recently, Mary Lou Carey of BackUP Telecom Consulting took a stab at defining this term. First, she established that routing is determined by the NPA (News - Alert) type of an area and by the local calling guide established by the local exchange carrier. Companies can set their own local calling areas in regard to rates, but will be charged the carrier access billing fee according to the rules of the local exchange carrier.

In some cases, seven digit calling is required, but in others, 10 digit calling is necessary in an overlay area while 11 digit calling is necessary where there is an area code split. One thing that local exchange carriers usually do is to break up the local and extended area service calling areas by rate center boundaries. This allows people to call neighboring towns as local calls, but may not allow for local calls across from two towns away.

NPA-NXXs are assigned to specific rate centers and switches. These switches can cover more than one rate center or calling areas, allowing local exchange carriers to set up different scenarios for routing various calls. Ultimately, the routing rules work on the calls depending on the number of digits required and each rate center covers a particular local access and transport area, deciding on available routes and routing the call correctly.

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Edited by Allison Boccamazzo







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