Siemens MC55 AT manual ATS0?, ATS0=n

7.11 ATS0 Set number of rings before automatically answering a call

Syntax

Read Command

ATS0?

Response(s)

<n>

OK ERROR

Write Command

ATS0=<n>

Response(s)

OK

ERROR

Reference(s)

V.250

PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last

§ % % % % % ! ! !

Parameter Description

<n>(num)(&W)(&V)

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.

•A CSD call will not be automatically answered when the module is in GPRS online mode, but it is possible in GPRS command mode. The application can detect a call by evaluating the RING line and determine whether to change into GPRS command mode or stay in GPRS online mode until GPRS is available again. To answer, to reject or to wait for automatically answering the incoming call the application has to switch into GPRS com- mand mode.

•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 11.19). 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.

MC55_ATC_V04.00	Page 138 of 475	3/17/06
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