--- asterisk-1.8.1/main/callerid.c	2010-07-14 11:48:36.000000000 -0400
+++ asterisk-1.8.1p1/main/callerid.c	2010-12-14 16:47:09.000000000 -0500
@@ -569,8 +569,11 @@
 		}
 		if (res == 1) {
 			/* Ignore invalid bytes */
-			if (b > 0xff)
+			if ((b > 0xff) && (cid->sawflag != 5) {
 				continue;
+			} else {
+				b = b & 0xff;
+			}
 			switch (cid->sawflag) {
 			case 0: /* Look for flag */
 				if (b == 'U')