Add some simplistic MTP3 parsing/encoding functions
diff --git a/src/mtp3.hrl b/src/mtp3.hrl
new file mode 100644
index 0000000..53025a7
--- /dev/null
+++ b/src/mtp3.hrl
@@ -0,0 +1,21 @@
+
+-define(MTP3_SERV_MGMT,		0).
+-define(MTP3_SERV_MTN,		1).
+-define(MTP3_SERV_SCCP,		3).
+-define(MTP3_SERV_TUP,		4).
+-define(MTP3_SERV_ISUP,		5).
+
+-record(mtp3_routing_label, {
+	sig_link_sel,
+	origin_pc,
+	dest_pc
+	}).
+
+-record(mtp3_msg, {
+	network_ind,
+	service_ind,
+	routing_label,
+	payload
+	}).
+
+