[asterisk-users] + on Caller-ID

[Richard Kenner]

> What is the proper way to format a caller-ID here in the U.S.?
> 
> Is it:
> +15705551212

That's the correct one.

> I've always seen it +15705551212, but as I understand it the country
> code for the US is 011, which to me would indicate you put
> 011-570-555-1212 as the callback number.

The country code for the US is 1, which is why +1570... is correct.
"+" means "this is an international call" and tells a cellphone, for 
example, to replace "+" with whatever is the international dialing code
for the location where it's currently located.  (In the US, that 011,
so you'd dial 011-1-570-555-1212, which is the correct way to dial that
number.)