pub fn classify_numeric_final_line(line: &str) -> Option<ExchangeMatch>Expand description
V.250 numeric final result codes (ATV0): 0 OK, 3 NO CARRIER, 4 ERROR,
6 NO DIALTONE, 7 BUSY, 8 NO ANSWER. 1 (CONNECT) is intermediate, 2 (RING)
unsolicited, 5 is unassigned.
In numeric mode a one-digit SMS body (0, 4, …) in a +CMGR/+CMGL reply is
indistinguishable from a result code and ends the exchange early; read SMS in
verbose mode (ATV1).