Siemens AC75 Benutzerhandbuch

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AC75_ATC_V01.002

Page 348 of 569

10/30/06

Confidential / Released

The V.250 

 (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 

When the 

 > 0) command is received, the MT will attempt to perform a GPRS attach if not yet

attached and if configured to do so (see 

, parameter 

). 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 

=1 command with no 

 or 

 values specified.

=0 does not perform an automatic GPRS detach. 

000

(&F)

Disables automatic answer mode.

001-255

Enables automatic answering after specified number of rings.

• 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 

• 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

 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 

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 

 or on power-up, even

though a value 

 greater than 0 was stored in the user profile with 

• If 

="GPRS/ATS0/withAttach","on" is selected, but the automatic GPRS attach attempt fails (e.g. the

network rejects the attach request), the 

 write command ends up with "ERROR" or "+CME ERROR:

unknown" after approx. 5 minutes, though the new 

 value takes effect. This is necessary because 

is used for circuit switched calls too. 

• ATS0 write command is PIN protected.

Read Command

ATS0?

Response(s)

OK

Write Command

ATS0=

Response(s)

OK

Reference(s)

PIN

ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge

4

Last

GSM 07.07

<n>

(num)(&W)(&V)