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536EX Chipset Developer’s Manual 23
Intel Confidential
AT Command Summary Tables
<DEL> 7F DTMF transition to off
u 75 Bump up the volume
d 64 Bump down the volume
<ESC> 1B End receive data state
! 21 Receive data abort
<CAN> 18 Clear transmit buffer of voice data
? 3F Transmit buffer space available query
Table 11. Voice DTE←DCE Character Pairs
Response Hex Code Function
<DLE> 10 Single <DLE> character in the data stream
<SUB> 1A <DLE><DLE> in data stream
<ETX> 3 End of Record mode data
X 58 Packet header for ‘Complex Event Detection Report’
. 2E Packet terminator for the ‘Complex Event Detection Report’
/ 2F Start of DTMF tone shielding
<DEL> 7F DTMF transition to off
0–930–39 DTMF tones 0–9
A–D41–44 DTMF tones A–D
* 2A DTMF tone *
# 23 DTMF tone #
o 6F Receive buffer overrun
c 63 1100 Hz fax calling tone
e 65 1300 Hz data calling tone
h 68 Local phone goes on hook
H 48 Local phone goes off hook
s 73 Presumed hang-up silence time-out
q 71 Presumed end-of-message quiet time-out
I 6C Loop current interruption
L 4C Loop current polarity reversal
r 72 Ringback
b 62 Busy/reorder/fast busy
d 64 Dial tone detected
u 75 Transmit buffer under-run
p 70 Line voltage increase (extension phone goes on-hook)
P 50 Line voltage decrease (extension phone goes off-hook)
a 61 Fax or data answer tone (2100 Hz)
Table 10. Voice DTE→DCE Character Pairs (Continued)
Response Hex Code Function