[asterisk-users] why doesn't "s" accept incoming call

[sean darcy]

Call from 'sip' to extension '+1xxxyyyzzzz' rejected because extension 
not found in context 'out'.

But
[out]
exten => s,1,NoOp( this is the extension: ${EXTEN})
exten => s,n,Answer()
exten => s,n(weasels),PlayBack(weasels-eaten-phonesys)
........

If I set "s" to "_." it works.

Shouldn't "s" work here? Is it because the extension includes a "+"?

sean