Make sure an incoming M3UA message is actually sent to registered service Pid
diff --git a/include/sccp.hrl b/include/sccp.hrl
index c19e512..83386cc 100644
--- a/include/sccp.hrl
+++ b/include/sccp.hrl
@@ -112,6 +112,15 @@
-define(SCCP_CAUSE_REF_NO_GTT_FOR_NATURE, 2#00010010).
-define(SCCP_CAUSE_REF_UNEQUIPPED_USER, 2#00010011).
+% SCCP sub-system numbers
+-define(SCCP_SSN_MAP_HLR, 6).
+-define(SCCP_SSN_MAP_VLR, 7).
+-define(SCCP_SSN_MAP_MSC, 8).
+-define(SCCP_SSN_MAP_EIR, 9).
+-define(SCCP_SSN_MAP_GMLC, 145).
+-define(SCCP_SSN_MAP_gsmSCF, 147).
+-define(SCCP_SSN_MAP_SGSN, 149).
+-define(SCCP_SSN_MAP_GGSN, 150).
% a single parsed SCCP message