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7.
Call related Commands
The AT Commands described in this chapter are related to Mobile Originated (MOC, i.e. outgoing) Calls and
Mobile Terminated (MTC, i.e. incoming) Calls.
7.1
Call Status Information
For Circuit switched calls, including voice, fax and data calls, call status information is available with URC
"+CIEV: call" (configurable via AT commands
calls. This list can be displayed on request via at commands
the ME in the form of an unsolicited result code "^SLCC" if configured with
URC "+CIEV: call" and URC "^SLCC" can be configured using AT command AT^SCFG. An overview of the pos-
sible configurations and their consequences for the availability of call status information will be given here.
Generally speaking, the call status values recognized by the ME are as follows:
•
active
•
held
•
dialing (MOC)
•
alerting (MOC)
•
incoming (MTC)
•
waiting (MTC)
•
terminating: The call is not active anymore, but inband information is still available.
•
dropped: The call has been suspended by the network, but may be resumed later.
The values "terminating" and "dropped" are not standardized for AT command AT+CLCC, and therefore only
available for command AT^SLCC. A call in any of these two states will not appear in the list of current calls as
displayed with AT+CLCC.
A call that is not recognized by the ME is considered to be in "unknown" state.
Some networks may schedule a traffic channel for a call that is not yet in the "active" state. This is reflected in
parameter
<traffic channel assigned>
Depending on the value of
and AT+CMER)
AT+CIND
•
when a state transition ends in state "active" or in state "unknown"
(if
setting <succ>=''restricted'').
AT^SCFG
•
when any state transition (including transitions beginning or ending in state "unknown") occurs in the list of
active calls, or when a traffic channel is established
(if
setting <succ>=''verbose'').
AT^SCFG
The indicator value for indicator "+CIEV: call" will be "1" if at least one call is in states "held" or "active", and "0"
otherwise.
Depending on the value of
command
and AT+CMER)
AT^SLCC
•
when a state transition ends in state "active" or in state "unknown" (if
•
when any state transition (including transitions beginning or ending in state "unknown") occurs in the list of
active calls, or when a voice channel is established (if
Due to compatibility considerations, the powerup default for
compatibility to the standard behaviour of indicator "+CIEV: call", while the default for setting
bose".
In order to see the URCs, event reporting for both indicators must be explicitely configured with the appropriate
AT commands.
MC55_ATC_V04.00
Confidential / Released
AT+CIND
of AT command
setting <succ>, Indicator "+CIEV" will be issued (if configured with
AT^SCFG
setting <sucs>, Indicator "^SLCC" will be issued (if configured with write
AT^SCFG
Page 126 of 475
and AT+CMER) or - in more detail - from the list of current
and AT^SLCC. It can also be issued by
AT+CLCC
AT^SLCC
and the corresponding URC.
AT^SLCC
AT^SCFG
setting <sucs>="verbose").
AT^SCFG
setting
AT^SCFG
and AT+CMER.
setting <sucs>="restricted")
is "restricted", offering
<succ>
<sucs>
3/17/06
is "ver-
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