If we download the complete book length programming guide, the information tag leg_state and the status for that lg_xxx are missed.
But if we download chapter by chapter we can get those information.

Here is the link:

http://www.cisco.com/en/US/docs/ios/voice/tcl/developer/guide/tclivrv2_ch5.html


Leg State
The state of the call leg and the corresponding status code is reported in lg_xxx format:
Value for xxx Call Leg
000 LEG_INIT
001 LEG_INCOMING_FIRST
001 LEG_INCINIT
002 LEG_INCACKED
003 LEG_INCPROCEED
004 LEG_ALERTING
005 LEG_INCCONNECTED
006 LEG_INCDISCONNECTING
006 LEG_INCOMING_LAST
007 LEG_OUTGOING_FIRST
007 LEG_OUTINIT
008 LEG_OUTPROCEED
009 LEG_OUTRINGING
010 LEG_OUTCONNECTED
011 LEG_OUTDISCONNECTING
011 LEG_OUTGOING_LAST
012 LEG_DISCONNECTED