AC75 AT Command Set
7.12 ATS0 s
AC75_ATC_V01.002 Page 170 of 569 10/30/06
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7.12 ATS0 Set number of rings before automatically answering a call
Syntax
Parameter Description
000(&F) Automatic answer mode is disabled.
001-255 Enable automatic answering after specified number of rings.
Notes
• This command works for MT data and fax calls.
• Autoanswering of CSD data and fax calls is supported on ASC0/Mux1 only.
• If <n> is set to higher values, the calling party may hang up before the call is automatically answered.
• The correlation between ATS7 and ATS0 is important.
Example: Call setup may fail if ATS7=30 and ATS0=20.
• Setting is local to the interface. It is allowed to have different settings on different interfaces. In such cases
the interface 'wins', which is idle and uses the smallest <n> value.
• The ATS0 write command is PIN protected.
• According to "3GPP TS 27.007 (GSM 07.07) : AT command set for User Equipment (UE)", ATS0 is also used
as GPRS compatibility command to answer automatically to a network request for PDP context activation
(see Section 11.21). Therefore, when the ATS0 write command is issued with <n> greater than 0, the ME will
attempt to perform a GPRS attach if not yet attached and if configured to do so (due to the setting
AT^SCFG="GPRS/ATS0/withAttach","on").
If the automatic GPRS attach fails the ME keeps trying to attach for approx. 5 minutes, before ATS0 ends up
with "ERROR" or "+CME ERROR: unknown", though the new <n> value takes effect. To avoid the risk of long
response times to ATS0 in such case take care that the parameter AT^SCFG=<gs0aa> is off, if autoanswer
mode is not needed for GPRS or if the mobile works in non-GPRS networks.
The GPRS attach will not be performed on recalling a stored user profile with ATZ or on powerup, even though
a value <n> greater than 0 was stored in the user profile with AT&W.
Read Command
ATS0?
Response(s)
<n>
OK
ERROR
Write Command
ATS0=<n>
Response(s)
OK
ERROR
Reference(s) PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4Last
V.250 ± + + + + + + - - -
<n>(num)(&W)(&V)