diff --git a/libpri.h b/libpri.h
index 9fea043..db55dfb 100755
--- a/libpri.h
+++ b/libpri.h
@@ -212,6 +212,25 @@
 
 #define PRI_COPY_DIGITS_CALLED_NUMBER
 
+/* Network Specific Facilities (AT&T) */
+#define PRI_NSF_NONE                   -1
+#define PRI_NSF_SID_PREFERRED          0xB1
+#define PRI_NSF_ANI_PREFERRED          0xB2
+#define PRI_NSF_SID_ONLY               0xB3
+#define PRI_NSF_ANI_ONLY               0xB4
+#define PRI_NSF_CALL_ASSOC_TSC         0xB9
+#define PRI_NSF_NOTIF_CATSC_CLEARING   0xBA
+#define PRI_NSF_OPERATOR               0xB5
+#define PRI_NSF_PCCO                   0xB6
+#define PRI_NSF_SDN                    0xE1
+#define PRI_NSF_TOLL_FREE_MEGACOM      0xE2
+#define PRI_NSF_MEGACOM                        0xE3
+#define PRI_NSF_ACCUNET                        0xE6
+#define PRI_NSF_LONG_DISTANCE_SERVICE  0xE7
+#define PRI_NSF_INTERNATIONAL_TOLL_FREE        0xE8
+#define PRI_NSF_ATT_MULTIQUEST         0xF0
+#define PRI_NSF_CALL_REDIRECTION_SERVICE       0xF7
+
 typedef struct q931_call q931_call;
 
 typedef struct pri_event_generic {
@@ -327,6 +346,9 @@ struct pri_sr;
    must be one of PRI_NETWORK or PRI_CPE.  switchtype should be PRI_SWITCH_* */
 extern struct pri *pri_new(int fd, int nodetype, int switchtype);
 
+/* Set Network Specific Facility for PRI */
+extern void pri_set_nsf(struct pri *pri, int nsf);
+
 /* Set debug parameters on PRI -- see above debug definitions */
 extern void pri_set_debug(struct pri *pri, int debug);
 
diff --git a/pri.c b/pri.c
index 1b9fcf1..ae59646 100755
--- a/pri.c
+++ b/pri.c
@@ -122,6 +122,12 @@ struct pri *pri_new(int fd, int node, int switchtype)
 	return __pri_new(fd, node, switchtype, NULL);
 }
 
+void pri_set_nsf(struct pri *pri, int nsf)
+{
+	if (pri)
+		pri->nsf = nsf;
+}
+
 char *pri_event2str(int id)
 {
 	switch(id) {
diff --git a/pri_internal.h b/pri_internal.h
index f623b00..b7882b2 100755
--- a/pri_internal.h
+++ b/pri_internal.h
@@ -48,6 +48,7 @@ struct pri {
 	int debug;			/* Debug stuff */
 	int state;			/* State of D-channel */
 	int switchtype;		/* Switch type */
+	int nsf;		/* Network-Specific Facility (if any) */
 	int localtype;		/* Local network type (unknown, network, cpe) */
 	int remotetype;		/* Remote network type (unknown, network, cpe) */
 
diff --git a/q931.c b/q931.c
index 2cd3ebe..14cd0f6 100755
--- a/q931.c
+++ b/q931.c
@@ -133,6 +133,25 @@ struct msgtype causes[] = {
 	{ PRI_CAUSE_INTERWORKING, "Interworking, unspecified" },
 };
 
+struct msgtype facilities[] = {
+       { PRI_NSF_SID_PREFERRED, "CPN (SID) preferred" },
+       { PRI_NSF_ANI_PREFERRED, "BN (ANI) preferred" },
+       { PRI_NSF_SID_ONLY, "CPN (SID) only" },
+       { PRI_NSF_ANI_ONLY, "BN (ANI) only" },
+       { PRI_NSF_CALL_ASSOC_TSC, "Call Associated TSC" },
+       { PRI_NSF_NOTIF_CATSC_CLEARING, "Notification of CATSC Clearing or Resource Unavailable" },
+       { PRI_NSF_OPERATOR, "Operator" },
+       { PRI_NSF_PCCO, "Pre-subscribed Common Carrier Operator (PCCO)" },
+       { PRI_NSF_SDN, "SDN (including GSDN)" },
+       { PRI_NSF_TOLL_FREE_MEGACOM, "Toll Free MEGACOM" },
+       { PRI_NSF_MEGACOM, "MEGACOM" },
+       { PRI_NSF_ACCUNET, "ACCUNET Switched Digital Service" },
+       { PRI_NSF_LONG_DISTANCE_SERVICE, "Long Distance Service" },
+       { PRI_NSF_INTERNATIONAL_TOLL_FREE, "International Toll Free Service" },
+       { PRI_NSF_ATT_MULTIQUEST, "AT&T MultiQuest" },
+       { PRI_NSF_CALL_REDIRECTION_SERVICE, "Call Redirection Service" }
+};
+
 #define FLAG_PREFERRED 2
 #define FLAG_EXCLUSIVE 4
 
@@ -1184,6 +1203,34 @@ static FUNC_DUMP(dump_facility)
 	pri_message(" ]\n");
 }
 
+static FUNC_DUMP(dump_network_spec_fac)
+{
+       pri_message("%c Network-Specific Facilities (len=%2d) [ ", prefix, ie->len);
+       if (ie->data[0] == 0x00) {
+               pri_message (code2str(ie->data[1], facilities, sizeof(facilities) / sizeof(facilities[0])));
+       }
+       else
+               dump_ie_data(ie->data, ie->len);
+       pri_message(" ]\n");
+}
+
+static FUNC_RECV(receive_network_spec_fac)
+{
+       return 0;
+}
+
+static FUNC_SEND(transmit_network_spec_fac)
+{
+       if (pri->nsf != PRI_NSF_NONE) {
+               ie->data[0] = 0x00;
+               ie->data[1] = pri->nsf;
+               return 4;
+       } else {
+               /* Leave off */
+               return 0;
+       }
+}
+
 char *pri_cause2str(int cause)
 {
 	return code2str(cause, causes, sizeof(causes) / sizeof(causes[0]));
@@ -1377,7 +1424,7 @@ struct ie ies[] = {
 	{ Q931_CALL_STATE, "Call State", dump_call_state, receive_call_state, transmit_call_state },
 	{ Q931_CHANNEL_IDENT, "Channel Identification", dump_channel_id, receive_channel_id, transmit_channel_id },
 	{ Q931_PROGRESS_INDICATOR, "Progress Indicator", dump_progress_indicator, receive_progress_indicator, transmit_progress_indicator },
-	{ Q931_NETWORK_SPEC_FAC, "Network-Specific Facilities" },
+	{ Q931_NETWORK_SPEC_FAC, "Network-Specific Facilities", dump_network_spec_fac, receive_network_spec_fac, transmit_network_spec_fac },
 	{ Q931_INFORMATION_RATE, "Information Rate" },
 	{ Q931_TRANSIT_DELAY, "End-to-End Transit Delay" },
 	{ Q931_TRANS_DELAY_SELECT, "Transmit Delay Selection and Indication" },
@@ -2120,7 +2167,7 @@ int q931_disconnect(struct pri *pri, q931_call *c, int cause)
 		return 0;
 }
 
-static int setup_ies[] = { Q931_BEARER_CAPABILITY, Q931_CHANNEL_IDENT, Q931_PROGRESS_INDICATOR, Q931_DISPLAY,
+static int setup_ies[] = { Q931_BEARER_CAPABILITY, Q931_CHANNEL_IDENT, Q931_PROGRESS_INDICATOR, Q931_NETWORK_SPEC_FAC, Q931_DISPLAY,
 	Q931_CALLING_PARTY_NUMBER, Q931_CALLED_PARTY_NUMBER, Q931_SENDING_COMPLETE, Q931_IE_ORIGINATING_LINE_INFO, -1 };
 
 static int gr303_setup_ies[] =  { Q931_BEARER_CAPABILITY, Q931_CHANNEL_IDENT, -1 };