> 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 AT+CIND and AT+CMER) or - in more detail - from the list of current calls. This list can be displayed on request via at commands AT+CLCC and AT^SLCC. It can also be issued by the ME in the form of an unsolicited result code "^SLCC" if configured with AT^SLCC and AT+CMER.
> URC "+CIEV: call" and URC "^SLCC" can be configured using AT command AT^SCFG. An overview of the possible 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> of AT command AT^SLCC and the corresponding URC.
> Depending on the value of AT^SCFG setting <succ>, Indicator "+CIEV" will be issued (if configured with AT+CIND and AT+CMER)

> • | when a state transition ends in state "active" or in state "unknown" (if AT^SCFG setting <succ>=''restricted'').

> • | 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 AT^SCFG setting <succ>=''verbose'').

> 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 AT^SCFG setting <sucs>, Indicator "^SLCC" will be issued (if configured with write command AT^SLCC and AT+CMER)

> • | when a state transition ends in state "active" or in state "unknown" (if AT^SCFG setting <sucs>="restricted")

> • | 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 AT^SCFG setting <sucs>="verbose").

> Due to compatibility considerations, the powerup default for AT^SCFG setting <succ> is "restricted", offering compatibility to the standard behaviour of indicator "+CIEV: call", while the default for setting <sucs> is "verbose".
> In order to see the URCs, event reporting for both indicators must be explicitly configured with the appropriate AT commands.