+#define CI_MPPLUS 22 /* Multi-Link-Plus-Procedure */
+#define CI_LDISC 23 /* Link-Discriminator */
+#define CI_LCPAUTH 24 /* LCP Authentication */
+#define CI_COBS 25 /* Consistent Overhead Byte Stuffing */
+#define CI_PREFELIS 26 /* Prefix Elision */
+#define CI_MPHDRFMT 27 /* MP Header Format */
+#define CI_I18N 28 /* Internationalization */
+#define CI_SDL 29 /* Simple Data Link */