diff --git a/mncc.h b/mncc.h
index ee8b1d7..1cc38e8 100644
--- a/mncc.h
+++ b/mncc.h
@@ -280,6 +280,15 @@ enum gsm_mncc_bcap {
 #define MNCC_F_CCCAP		0x0800
 #define MNCC_F_KEYPAD		0x1000
 #define MNCC_F_SIGNAL		0x2000
+#define MNCC_F_GCR		0x4000
+#define MNCC_F_HIGHL_COMPAT	0x8000
+#define MNCC_F_LOWL_COMPAT	0x10000
+
+/* UPDATEME when adding new MNCC_F_* entries above */
+#define MNCC_F_ALL             0x1ffff
+
+#define GSM_MAX_LOWL_COMPAT	16 /* (18 with TLV) */
+#define GSM_MAX_HIGHL_COMPAT	3 /* (5 with TLV) */
 
 struct gsm_mncc {
 	/* context based information */
@@ -319,6 +328,20 @@ struct gsm_mncc {
 
 	struct osmo_gcr_parsed gcr;
 	char		sdp[1024];
+
+	/* Additional information that extends current socket interface version. */
+
+	/* The content requals of Low Layer compatibility IE, described in 3GPP TS 24.008 §10.5.4.18. */
+	struct gsm_mncc_lowl_compat {
+		uint8_t	len;
+		uint8_t	compat[GSM_MAX_LOWL_COMPAT];
+	} llc;
+
+	/* The content requals of High Layer compatibility IE, described in 3GPP TS 24.008 §10.5.4.16. */
+	struct gsm_mncc_highl_compat {
+		uint8_t	len;
+		uint8_t	compat[GSM_MAX_HIGHL_COMPAT];
+	} hlc;
 };
 
 struct gsm_data_frame {
diff --git a/mncc.py b/mncc.py
index 9f95a71..f55b6c1 100644
--- a/mncc.py
+++ b/mncc.py
@@ -188,6 +188,12 @@ MNCC_F_SSVERSION = 0x0400 # macro
 MNCC_F_CCCAP = 0x0800 # macro
 MNCC_F_KEYPAD = 0x1000 # macro
 MNCC_F_SIGNAL = 0x2000 # macro
+MNCC_F_GCR = 0x4000 # macro
+MNCC_F_HIGHL_COMPAT = 0x8000 # macro
+MNCC_F_LOWL_COMPAT = 0x10000 # macro
+MNCC_F_ALL = 0x1ffff # macro
+GSM_MAX_LOWL_COMPAT = 16 # macro
+GSM_MAX_HIGHL_COMPAT = 3 # macro
 MNCC_SOCK_VERSION = 8 # macro
 
 # values for enumeration 'gsm48_bcap_itcap'
@@ -502,6 +508,24 @@ gsm_mncc_bcap = ctypes.c_uint32 # enum
 class struct_gsm_mncc(Structure):
     pass
 
+class struct_gsm_mncc_lowl_compat(Structure):
+    pass
+
+struct_gsm_mncc_lowl_compat._pack_ = 1 # source:False
+struct_gsm_mncc_lowl_compat._fields_ = [
+    ('len', ctypes.c_ubyte),
+    ('compat', ctypes.c_ubyte * 16),
+]
+
+class struct_gsm_mncc_highl_compat(Structure):
+    pass
+
+struct_gsm_mncc_highl_compat._pack_ = 1 # source:False
+struct_gsm_mncc_highl_compat._fields_ = [
+    ('len', ctypes.c_ubyte),
+    ('compat', ctypes.c_ubyte * 3),
+]
+
 class struct_gsm_mncc_clir(Structure):
     pass
 
@@ -538,6 +562,9 @@ struct_gsm_mncc._fields_ = [
     ('lchan_mode', ctypes.c_ubyte),
     ('gcr', struct_osmo_gcr_parsed),
     ('sdp', ctypes.c_char * 1024),
+    ('llc', struct_gsm_mncc_lowl_compat),
+    ('hlc', struct_gsm_mncc_highl_compat),
+    ('PADDING_0', ctypes.c_ubyte * 3),
 ]
 
 class struct_gsm_data_frame(Structure):
@@ -625,6 +652,7 @@ __all__ = \
     'GSM48_BCAP_UR_12000', 'GSM48_BCAP_UR_1200_75',
     'GSM48_BCAP_UR_2400', 'GSM48_BCAP_UR_300', 'GSM48_BCAP_UR_4800',
     'GSM48_BCAP_UR_9600', 'GSM_BAD_FRAME', 'GSM_MAX_FACILITY',
+    'GSM_MAX_HIGHL_COMPAT', 'GSM_MAX_LOWL_COMPAT',
     'GSM_MAX_SSVERSION', 'GSM_MAX_USERUSER', 'GSM_MNCC_BCAP_AUDIO',
     'GSM_MNCC_BCAP_FAX_G3', 'GSM_MNCC_BCAP_OTHER_ITC',
     'GSM_MNCC_BCAP_RESERVED', 'GSM_MNCC_BCAP_SPEECH',
@@ -633,10 +661,11 @@ __all__ = \
     'MNCC_ALERT_REQ', 'MNCC_BRIDGE', 'MNCC_CALL_CONF_IND',
     'MNCC_CALL_PROC_REQ', 'MNCC_DISC_IND', 'MNCC_DISC_REQ',
     'MNCC_FACILITY_IND', 'MNCC_FACILITY_REQ', 'MNCC_FRAME_DROP',
-    'MNCC_FRAME_RECV', 'MNCC_F_BEARER_CAP', 'MNCC_F_CALLED',
-    'MNCC_F_CALLING', 'MNCC_F_CAUSE', 'MNCC_F_CCCAP',
+    'MNCC_FRAME_RECV', 'MNCC_F_ALL', 'MNCC_F_BEARER_CAP',
+    'MNCC_F_CALLED', 'MNCC_F_CALLING', 'MNCC_F_CAUSE', 'MNCC_F_CCCAP',
     'MNCC_F_CONNECTED', 'MNCC_F_EMERGENCY', 'MNCC_F_FACILITY',
-    'MNCC_F_KEYPAD', 'MNCC_F_PROGRESS', 'MNCC_F_REDIRECTING',
+    'MNCC_F_GCR', 'MNCC_F_HIGHL_COMPAT', 'MNCC_F_KEYPAD',
+    'MNCC_F_LOWL_COMPAT', 'MNCC_F_PROGRESS', 'MNCC_F_REDIRECTING',
     'MNCC_F_SIGNAL', 'MNCC_F_SSVERSION', 'MNCC_F_USERUSER',
     'MNCC_HOLD_CNF', 'MNCC_HOLD_IND', 'MNCC_HOLD_REJ',
     'MNCC_LCHAN_MODIFY', 'MNCC_MODIFY_CNF', 'MNCC_MODIFY_IND',
@@ -660,7 +689,8 @@ __all__ = \
     'struct_gsm_mncc_bearer_cap_data', 'struct_gsm_mncc_bridge',
     'struct_gsm_mncc_cause', 'struct_gsm_mncc_cccap',
     'struct_gsm_mncc_clir', 'struct_gsm_mncc_facility',
-    'struct_gsm_mncc_hello', 'struct_gsm_mncc_number',
+    'struct_gsm_mncc_hello', 'struct_gsm_mncc_highl_compat',
+    'struct_gsm_mncc_lowl_compat', 'struct_gsm_mncc_number',
     'struct_gsm_mncc_progress', 'struct_gsm_mncc_rtp',
     'struct_gsm_mncc_ssversion', 'struct_gsm_mncc_useruser',
     'struct_osmo_gcr_parsed', 'struct_sockaddr_storage']