Specifications

3GPP
3GPP TS 27.007 V6.3.0 (2003-
06)
13
7
Release 6
10.2.2 Network requested PDP context activation
In this mode of operation, the MT behaves like an answering modem and accepts the normal V.250 commands
associated with answering a call. If Packet Domain-specific configuration commands are required, they may be sent to
the MT as part of the modem initialization commands.
The +CGAUTO command is used to select modem compatibility mode.
10.2.2.1 Automatic response to a network request for PDP context activation 'S0'
The V.250 'S0=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 'S0=n' (n>0) command is received, the MT shall attempt to perform a PS attach if it is not already attached.
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 unsolicited result code RING 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 +CGANS=1 with no <L2P> or <cid> values specified.
NOTE: The 'S0=n' (n=0) command does not perform an automatic PS detach.
Implementation
Optional.
10.2.2.2 Manual acceptance of a network request for PDP context activation 'A'
The V.250 'A' (Answer) command may be used to accept a network request for a PDP context activation announced by
the unsolicited result code RING. The MT responds with CONNECT, enters V.250 online data state and follows the
same procedure as it would after having received a +CGANS=1 with no <L2P> or <cid> values specified. It is an error
to issue the 'A' command when there is no outstanding network request.
Implementation
Optional.
10.2.2.3 Manual rejection of a network request for PDP context activation 'H'
The V.250 'H' or 'H0' (On-hook) command may be used to reject a network request for PDP context activation
announced by the unsolicited result code RING. The MT responds with OK. It is an error to issue the 'H' command
when there is no outstanding network request.
NOTE: This is an extension to the usage of the 'H' command that is described in ITU-T V.250.
Implementation
Optional.
11 Commands for VGCS and VBS
This clause defines commands that a TE may use to control a VGCS or VBS supporting MT. The requirements for the
VGCS and VBS are included in the following specifications:
- Voice Group Call service (VGCS): GSM 42.068 [55],GSM 43.068 [49],GSM 44.068 [52];
- Voice Broadcast Service (VBS): GSM 42.069 [56],GSM 43.069 [50],GSM 44.069 [53].
It is anticipated that VGCS or VBS supporting MTs will vary widely in functionality.
A comprehensive set of VGCS and VBS-specific commands is defined in clause 11.1 to provide the flexibility needed
by the more complex MT. The commands use the extended information and error message capabilities described in this
specification.