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TC63_ATC_V00.490

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5/24/05

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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. 

For Circuit switched calls, including voice, fax and data calls, call status information is available with URC

: call" (configurable via AT commands 

 and 

) or - in more detail - from the list of current

calls. This list can be displayed on request via at commands 

. It can also be issued by

the ME in the form of an unsolicited result code "

 and 

.

URC "

: call" and URC "

" can be configured using AT command 

. 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 

, and therefore only

available for command 

. A call in any of these two states will not appear in the list of current calls as

displayed with 

. 

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 

 of AT command 

 and the corresponding URC.

Depending on the value of 

 setting 

, Indicator "

" will be issued (if configured with

• when a state transition ends in state "active" or in state "unknown" 

(if 

=''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 

=''verbose''). 

The indicator value for indicator "

: call" will be "1" if at least one call is in states "held" or "active", and "0"

otherwise.

Depending on the value of 

, Indicator "

" will be issued (if configured with write

command 

 and 

) 

• when a state transition ends in state "active" or in state "unknown" (if 

="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 

 setting 

="verbose"). 

Due to compatibility considerations, the powerup default for 

 setting 

 is "restricted", offering

compatibility to the standard behaviour of indicator "

: call", while the default for setting 

 is "ver-

bose".

In order to see the URCs, event reporting for both indicators must be explicitely configured with the appropriate

AT commands.