Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!rutgers!texbell!vector!telecom-gateway
From: jjd@necis.nec.com (Jeff DeSantis)
Newsgroups: comp.dcom.telecom
Subject: Re: Parsing Dialed Digits
Message-ID: <telecom-v09i0466m09@vector.dallas.tx.us>
Date: 20 Oct 89 14:13:45 GMT
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In article <telecom-v09i0429m04@vector.dallas.tx.us> vrdxhq!pbs!PCRABLE@eecs.
nwu.edu (VAX WIZZ) writes:

> How can I tell whether to take the next two or the next three
>digits as the country code ?

It depends on the first two digits.

If the first two digits are a valid country code, then you do not have
to look at the third digit.

For example, if the first two digits are 44, you know you have a call
to the United Kingdom.

Another approach would be to consider all country codes to consist of
three digits.  In this case all 44X (440-449) country codes would be
calls to the United Kingdom.

Either approach requires maintaining a list of country codes against
which you can verify the call's country code.