code: def _initChannelTypesList(self):
          
          if self.checkVersion('1.4'):
              cmd = "core show channeltypes"
          else:
              cmd = "show channeltypes"
          cmdresp = self.executeCommand(cmd)
          self._chantypes = set()
          for line in cmdresp.splitlines()[2:]:
              mobj = re.match('\s*(\S+)\s+.*\s+(yes|no)\s+', line)
              if mobj:
                  self._chantypes.add(mobj.group(1).lower())
docs: Query Asterisk Manager Interface to initialize internal list of 
          supported channel types.
          
          CLI Command - core show applications