local calls

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Aug 14th, 2009
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Well, it's not a technical question but there is a confusing point to me. In USA they have 7 digits dialing and 10 digits dialing and both are for local calls, so when they use 7 digits and when they use 10 digits. I think it will be an easy question for people who already live in USA :).


Thanks in advance.


Regards,

Khaled

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cisco steps Fri, 08/14/2009 - 07:37
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not to be so technical.it depends on CO ( CENTRAL OFFICE ) there is either ESS5 or ESS7 witch is switch that has the config. so let say I leave in(A)city of 5000 people that is not a large area and no need to be divided so all the dial is the 7 digits. But if you leave in city (B)of 15000 people then the phone company configure the switches to require the AREA CODE and that where You ADD 3 to 7 = 10


Hope that helps


Jonathan Schulenberg Fri, 08/14/2009 - 18:06
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    2017 IP Telephony

The NANPA has several tools that allow you to identify where this will apply as well.


http://www.nanpa.com/tools/index.html


http://www.nanpa.com/number_resource_info/area_code_maps.html


Specifically, the NPA Search tool will show you the dial plan rules for a specific NPA (area code).

http://www.nanpa.com/nas/public/npa_query_step1.do?method=resetNpaReportModel

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