get_state
Description:
public CallState get_state (out CallFlags flags, out unowned HashTable<void*,void*> details, out unowned CallStateReason reason)
  
  Parameters:
| this | |
| flags | a place to set the value of flags | 
| details | a place to set the value of state_details | 
| reason | a place to set the value of state_reason | 
Returns:
| the value of state |