_1NXXNXXXXX / _NXXNXXXXX were one digit short (10/9 characters instead of
the correct 11/10 for a full NANP number: 1 + area code(3) + exchange(3) +
subscriber(4)). Asterisk's exact-length pattern matching never matched a
real dialed number as a result — confirmed live via "extension not found
in context 'intercom'" on every outbound test call, traced by dumping
`dialplan show intercom` and counting characters against the actual
pattern. This was the real root cause underneath everything else fixed
along the way (stale settings file, the #include not reaching the live
config) — those were real bugs too, but this one was still there
underneath all of them.
Claude
4457b471d9