diff -Naur libpri-1.4.7.orig/pri_internal.h libpri-1.4.7/pri_internal.h
--- libpri-1.4.7.orig/pri_internal.h	2008-08-05 22:18:12.000000000 +0000
+++ libpri-1.4.7/pri_internal.h	2008-12-04 04:06:10.000000000 +0000
@@ -193,6 +193,7 @@
 	int transmoderate;
 	int transmultiple;
 	int userl1;
+	int nouserl1;			/* Nonzero if userl1 unspecified */
 	int userl2;
 	int userl3;
 	int rateadaption;
diff -Naur libpri-1.4.7.orig/q931.c libpri-1.4.7/q931.c
--- libpri-1.4.7.orig/q931.c	2008-08-05 22:18:12.000000000 +0000
+++ libpri-1.4.7/q931.c	2008-12-04 04:15:56.000000000 +0000
@@ -766,8 +766,16 @@
 		while (pos < len && !(ie->data[pos-1] & 0x80)) {
 			pos++;
 		}
-		
+		/* Octet 5 was present */
+		call->nouserl1 = 0;	
 	}
+	else if( (call->transcapability & PRI_TRANS_CAP_RESTRICTED_DIGITAL) ||
+		(call->transcapability & PRI_TRANS_CAP_DIGITAL) ) {
+		/* The call was either DIGITAL or RESTRICTED digital, and
+		   octet 5 was *not* present. This is acceptable per note 6,
+		   page 60 of Q.931 */
+		call->nouserl1 = 1;
+	} 
 
 	/* Look for octet 6; this is identified by bits 5,6 == 10 */
      	if (pos < len && 
@@ -820,6 +828,13 @@
 		/* Apparently EuroISDN switches don't seem to like user layer 2/3 */
 		return 4;
 	}
+
+	if ( ( (tc & PRI_TRANS_CAP_DIGITAL) || 
+		(tc & PRI_TRANS_CAP_RESTRICTED_DIGITAL) ) && call->nouserl1 ) {
+		/* Octet 5 should remain absent */
+		return 4;
+	}
+
 	if (call->transmoderate != TRANS_MODE_PACKET) {
 		/* If you have an AT&T 4ESS, you don't send any more info */
 		if ((pri->switchtype != PRI_SWITCH_ATT4ESS) && (call->userl1 > -1)) {
diff -Naur libpri-1.4.7.orig/version.c libpri-1.4.7/version.c
--- libpri-1.4.7.orig/version.c	1970-01-01 00:00:00.000000000 +0000
+++ libpri-1.4.7/version.c	2008-12-04 04:11:16.000000000 +0000
@@ -0,0 +1,14 @@
+/*
+ * version.c
+ * Automatically generated
+ */
+
+#include "libpri.h"
+
+static const char pri_version[] = "1.4.7";
+
+const char *pri_get_version(void)
+{
+	return pri_version;
+}
+