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en.wikipedia.or /wiki/Telephone_numbering_plan

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Posted by crouse

pirate.shu.edu/~wachsmut/ira/topo/open.html

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Posted by crouse

It should be noted that open and closed dialing plans are not the same as open and closed numbering plans, Closed numbering is basically telephone numbering plan which we use in digital telephony.

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Posted by waqasahmad

Closed numbering is basically telephone numbering plan which we use in digital telephony.

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Posted by HamidAliKhan

Visit following link:

http://en.wikipedia.or /wiki/Telephone_numbering_plan

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Posted by sagitraz