On Apr 2, 8:05*pm, Stephen Sprunk wrote:

Note that our current ten-digit scheme allows for nearly 6.4 billion
phone numbers, which would be plenty for the 400 million people living
within the NANP if they weren't assigned so inefficiently.

It amazes me that dedicated outward trunks of a PBX get dialable
numbers even though no on ever calls them. They should get specially
identified numbers (eg in the 1nn-xxxx series) so they don't waste
addressable numbers. Actually, inward trunks to a PBX really need
only one addressable number, all the hunt lines could be a special
series, too.

Heck, I think even in panel days a hunt group didn't need to be
consecutively numbered lines, only step demanded that.