What does the different Call states in the Android telephony stack represent?

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广开言路
广开言路 2021-01-02 06:36

The internal Android class com.android.internal.telephony.Call contains an enum called State and defined as follows:

public enum State {
            


        
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  • 2021-01-02 06:56

    Okay, this is my own attempt at answering the question:

    /** Call is idle. */
    IDLE,
    /** Call is active i.e. audio paths are connected. */
    ACTIVE,
    /** We have placed the call on hold. */
    HOLDING,
    /** Outgoing dialling call initiated. */
    DIALING,
    /** Outgoing call is alerting receiving party. */
    ALERTING,
    /** Incoming call ready for pickup. */ 
    INCOMING,
    /** Incoming call is waiting for pickup, while another call is in progress. */
    WAITING,
    /** Call is disconnected, by either party. */
    DISCONNECTED,
    /** Call is currently being disconnected. */
    DISCONNECTING;
    
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  • 2021-01-02 06:59
    3GPP TS 27.007 version 13.5.0 Release 13
    
    List current calls +CLCC
    
    Command 
    +CLCC
    
    Possible response(s)
    [+CLCC: <ccid1>,<dir>,<stat>,<mode>,<mpty>[,<number>
    ,<type>[,<alpha>[,<priority>[,<CLI validity>]]]]
    [<CR><LF>+CLCC: <ccid2>,<dir>,<stat>,<mode>,<mpty>[,
    <number>,<type>[,<alpha>[,<priority>[,<CLI validity>
    ]]]]
    [...]]]
    +CME ERROR: <err>
    
    <stat>: integer type (state of the call)
    0 active
    1 held
    2 dialing (MO call)
    3 alerting (MO call)
    4 incoming (MT call)
    5 waiting (MT call) 
    
    My interpretation:
    
    0 active: call in progress (setup was successful)
    1 held: call on hold
    2 dialing (MO call): number dialed
    3 alerting (MO call): number dialed and the called party is alerted
    4 incoming (MT call): incoming call, ringtone played (AT RING notification)
    5 waiting (MT call): call waiting notification while another call is active (if call waiting feature enabled)
    
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