This reflects the call state in the internal state machine. Here is an extract of the most usual values:
1_IOPENING: an incoming call
1_OPREPARING: preparing an outgoing call (the sip request is not sent yet)
1_OOPENING: opening an outgoing call (sip request sent)
1_ORINGING: outgoing call launched, the remote party is ringing
1_INERROR: error on call
2_OPENED: call is established
2_HOLDING: call is currently put on hold (sip re-invite on progress)
2_HELD: call is on hold
2_RESUMING: call is currently resumed (sip re-invite on progress)
2_TRANSFERING: call is currently on transfer. It could only be occurred when using packing place.
2_BTRANSFERING: call is currently on blind transfer. It could only be occurred on a mobile trader.
3_ITOPENING: an Intercom incoming call
3_ITOPENED: Intercom call is established
3_ITOOPENING: opening an Intercom outgoing call
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