Specifications

MC55 AT Command Set
11.19 ATS0
s
MC55_ATC_V03.03 Page 282 of 459 9/9/05
Confidential / Released
11.19 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.
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.
• If 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 belongs
to the automatic context activation procedure. If the AT command which caused the collision was a CS data
call, the CONNECT response does not belong to this data call but to the GPRS. This can be detected if ATX
is not set to 0. 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.
• The automatic 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.
• If AT^SCFG="GPRS/ATS0/withAttach","on" is selected but the automatic GPRS attach fails (e.g. the network
rejects the attach request), the write command returns error, though the new value takes effect. This is nec-
essary because ATS0 is used for circuit switched calls too.
If the MT is not able to attach to the GPRS for more than 5 minutes, then the write command returns "ERROR"
or "+CME ERROR: unknown", although the MT continues trying to attach.
• 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 MUX1 MUX2 MUX3 Charge  Last
GSM 07.07 § % % % % % ! ! !
<n>
(num)(&W)(&V)