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TC63 AT Command Set

11.21 ATS0

TC63_ATC_V00.490 Page 307 of 501 5/24/05

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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.

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>). Failure will result in ERROR being

returned to the TE. 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 intermediate result code CONNECT. The MT then enters

V.250 online data state and follows the same procedure as it would after having received a AT+CGANS=1 com-

mand 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,

if a n > 0 setting was stored in the user profile with AT&W.

• If 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 necessary because ATS0 is used for circuit switched calls too.

• ATS0 write command is PIN protected.

Read Command

ATS0?

Response(s)

<n>

Write Command

ATS0=<n>

Response(s)

Reference(s) PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

GSM 07.07 § % % % % % % ! ! !

<n>

(num)(&W)(&V)

1 2 ... 302 303 304 305 306 307 308 309 310 311 312 ... 500 501

Siemens TC63 User Manual Page 307

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