Siemens AC75 - Manual (Page 348)

AC75 AT Command Set
11.21 ATS0
s
AC75_ATC_V01.002 Page 348 of 569 10/30/06
Confidential / Released
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
Parameter Description
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.
Read Command
ATS0?
Response(s)
<n>
OK
Write Command
ATS0= <n>
Response(s)
OK
Reference(s) PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge
4
Last
GSM 07.07 ± + + + + + + - - -
<n>
(num)(&W)(&V)