[%

  # Returns a list of RTP-enabled interfaces from all hosts
  #
  # @return out		The array of interfaces

X_out = { };

FOREACH X_host IN hosts.keys;
	X_hd = hosts.$X_host;
	X_roles = X_hd.role;
	IF X_roles.grep('^rtp$').size() == 0;
		NEXT;
	END;

	FOREACH X_iface IN X_hd.interfaces;
		X_if = X_hd.$X_iface;
		X_types = X_if.type;
		X_tgl = X_types.grep('^rtp_.');
		IF X.tgl.size() == 0;
			NEXT;
		END;

		X_type = X_tgl.0;
		X_type = X_type.remove('^rtp_');
		X_out.$X_type = 1;
	END;
END;

X_vals = X_out.keys;
out = X_vals.sort;
-%]