On 3/2/22 20:46, Darren wrote:
Why spaces for NANPA? This is very unusual. Is that written in a standard somewhere? I'm not sure on the other two but in the US there are users who actually would be confused seeing spaces.
Agreed. If the intent of E.123 is to format telephone numbers for human readability, it should do so in a manner that is consistent with the existing convention for humans in the country where the number exists. For NANPA, the National format would be (NPA) NXX-XXXX or NPA-NXX-XXXX. If other countries typically publish phone numbers using other punctuation as separators such as dots or colons, then use those for that country's National format. For International, the use of spaces makes sense. The ambiguity for NANPA is that it is country code 1 and the local convention is to use a leading 1 for "area code follows" to differentiate from a 7-digit local number in those locations where 7-digit dialing is still in use. That ambiguity really doesn't affect the digits input, however. When dialed en banc such as on mobiles with a SEND button, the leading 1 can usually be omitted with no effect on the call going through. If a NANPA resident sees a phone number with just spaces they're likely to assume that it's an international call. -- Jay Hennigan - jay at west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV