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AT Commands
AT command formats
24
Extended result codes
Dial tone detect
Busy tone detect
Command
Extended
Result code
Dial tone
Detect
Busy signal
Detect
X0 Disable Disable Disable
X1 Enable Disable Disable
X2 Enable Enable Disable
X3 Enable Disable Enable
X4 (default) Enable Enable Enable
X5 Enable Enable Enable
X6 Enable Enable Enable
X7 Disable Enable Enable
Disabled: Displays only the basic result codes: OK,
CONNECT, RING, NO CARRIER, and ERROR.
Enabled: Displays basic result codes, along with the connect
message and the modem’s data rate, and an
indication of the modem’s error correction and data
compression operation
Disabled: The modem dials a call regardless of whether it
detects a dial tone. The period of time the modem
waits before dialing is specified in register S6.
Enabled: The modem dials only upon detection of a dial tone,
and disconnects the call if the dial tone is not
detected within 10 seconds.
Disabled: The modem ignores any busy tones it receives.