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

Question

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

public enum State {
            


        

Answer 1

3GPP TS 27.007 version 13.5.0 Release 13

List current calls +CLCC

Command 
+CLCC

Possible response(s)
[+CLCC: ,,,,[,
,[,[,[,]]]]
[+CLCC: ,,,,[,
,[,[,[,
]]]]
[...]]]
+CME ERROR: 

: 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)