docs: private synchronized String getCallerId10()
      {
          final String[] parsedCallerId;
  
          if (!callerIdCreated)
          {
              rawCallerId = request.get("callerid");
              callerIdCreated = true;
          }
  
          parsedCallerId = AstUtil.parseCallerId(rawCallerId);
          if (parsedCallerId[1] == null)
          {
              return parsedCallerId[0];
          }
          return parsedCallerId[1];
      }