BGS2T AT Command Set
11.21 ATS0
BGS2T_ATC_V01.301 Page 335 of 554 1/31/12
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11.21 ATS0 Automatic Response to 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 [35].
When the ATS0=<n> (<n> > 0) command is received, BGS2T will attempt to perform a GPRS attach if not yet
attached and if configured to do so (see AT^SCFG, parameter <gs0aa>). Subsequently, the ME will announce
a network request for PDP context activation by issuing the URCs "RING" or "+CRING: GPRS" to the TE, followed
by the intermediate result code CONNECT. The ME 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)
Disable automatic response mode.
001-255 Enable automatic response 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 3GPP TS 24.008 [32]). 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.
Read Command
ATS0?
Response(s)
<n>
OK
Write Command
ATS0=<n>
Response(s)
OK
PIN ASC0 MUX1 MUX2 MUX3 Last Reference(s)
± + + + + - - 3GPP TS 27.007 [35]
<n>
(num)(&W)(&V)
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