Siemens AC75 manual 11.21 ATS0

AC75 AT Command Set

11.21 ATS0

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11.21 ATS0 Automatic response to a network request for PDP context activation

The V.250 ATS0=<n> (Automatic answer) command may be used to turn off (n=0) and on (n>0) the automatic response to a network request for a PDP context activation. See also "3GPP TS 27.007 (GSM 07.07): AT com- mand set for User Equipment (UE)".

When the ATS0=<n> (<n> > 0) command is received, the MT will attempt to perform a GPRS attach if not yet attached and if configured to do so (see AT^SCFG, parameter <gs0aa>). Subsequently, the MT will announce a network request for PDP context activation by issuing the URC RING or CRING to the TE, followed by the inter- mediate result code CONNECT. The MT then enters V.250 online data state and follows the same procedure as it would after receiving a AT+CGANS=1 command with no <L2P> or <cid> values specified.

ATS0=0 does not perform an automatic GPRS detach.

Syntax

Read Command

ATS0?

Response(s)

<n>

OK

Write Command

ATS0=<n>

Response(s)

OK

Reference(s)

GSM 07.07

PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

± + + + + + + - - -

Parameter Description

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

000(&F)	Disables automatic answer mode.
001-255	Enables automatic answering after specified number of rings.

Notes

•If different settings are used on each interface, and a request for PDP context activation is received, the inter- face 'wins' which is idle and uses the smallest ATS0 value.

•When a network request for PDP context activation is answered automatically and another AT command is issued at the same time on the same interface then this AT command will not be executed. Any response relates to the automatic context activation procedure. If the AT command which caused the collision was a CS data call, the CONNECT response does not pertain to this data call but to GPRS. This can be detected if ATX is not set to 0. The CS data call will issue CONNECT <text>, GPRS will issue CONNECT only.

•A network request for PDP context activation has a maximum duration of approximately 40 seconds (for details see GSM 04.08). A RING/CRING URC is issued every 5 seconds, so setting parameter <n> to values greater than 7 will not allow a successful context activation and is not recommended.

•Automatic GPRS attach will not be performed on recalling a stored user profile with ATZ or on power-up, even though a value <n> greater than 0 was stored in the user profile with AT&W.

•If AT^SCFG="GPRS/ATS0/withAttach","on" is selected, but the automatic GPRS attach attempt fails (e.g. the network rejects the attach request), the ATS0 write command ends up with "ERROR" or "+CME ERROR: unknown" after approx. 5 minutes, though the new <n> value takes effect. This is necessary because ATS0 is used for circuit switched calls too.

•ATS0 write command is PIN protected.

AC75_ATC_V01.002	Page 348 of 569	10/30/06
Confidential / Released