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cosmetic: Add some comments with spec references

Change-Id: I131dca5be9313d3beb51ec9d5f507552ae6c9d84
---
M include/osmocom/sccp/sccp_types.h
M include/osmocom/sigtran/protocol/sua.h
2 files changed, 6 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/49/38549/1

diff --git a/include/osmocom/sccp/sccp_types.h b/include/osmocom/sccp/sccp_types.h
index 17018d2..bc11258 100644
--- a/include/osmocom/sccp/sccp_types.h
+++ b/include/osmocom/sccp/sccp_types.h
@@ -189,6 +189,7 @@
 	SCCP_PROTOCOL_RETURN_MESSAGE	    = 8,
 };
 
+/* ITU-T Q.713, Section 3.11 Release cause */
 enum sccp_release_cause {
 	SCCP_RELEASE_CAUSE_END_USER_ORIGINATED	    = 0,
 	SCCP_RELEASE_CAUSE_END_USER_CONGESTION	    = 1,
@@ -209,6 +210,7 @@
 	SCCP_RELEASE_CAUSE_SCCP_FAILURE		    = 16,
 };
 
+/* ITU-T Q.713, Section 3.12 Return cause */
 enum sccp_return_cause {
 	SCCP_RETURN_CAUSE_NO_TRANSLATION_NATURE	    = 0,
 	SCCP_RETURN_CAUSE_NO_TRANSLATION	    = 1,
@@ -227,6 +229,7 @@
 	SCCP_RETURN_CAUSE_SEGMENTATION_FAILURE	    = 14
 };
 
+/* ITU-T Q.713, Section 3.13 Reset cause */
 enum sccp_reset_cause {
 	SCCP_RESET_CAUSE_END_USER_ORIGINATED	    = 0,
 	SCCP_RESET_CAUSE_SCCP_USER_ORIGINATED	    = 1,
@@ -242,6 +245,7 @@
 	SCCP_RESET_CAUSE_RESERVED		    = 11,
 };
 
+/* ITU-T Q.713, Section 3.14 Error cause */
 enum sccp_error_cause {
 	SCCP_ERROR_LRN_MISMATCH_UNASSIGNED	    = 0, /* local reference number */
 	SCCP_ERROR_LRN_MISMATCH_INCONSISTENT	    = 1,
@@ -250,7 +254,7 @@
 	SCCP_ERROR_UNQUALIFIED			    = 4,
 };
 
-/* ITU=T Q.713 Section 3.15 */
+/* ITU-T Q.713 Section 3.15 Refusal cause */
 enum sccp_refusal_cause {
 	SCCP_REFUSAL_END_USER_ORIGINATED	    = 0,
 	SCCP_REFUSAL_END_USER_CONGESTION	    = 1,
diff --git a/include/osmocom/sigtran/protocol/sua.h b/include/osmocom/sigtran/protocol/sua.h
index 70c16ba..4ce88f9 100644
--- a/include/osmocom/sigtran/protocol/sua.h
+++ b/include/osmocom/sigtran/protocol/sua.h
@@ -130,6 +130,7 @@
 #define SUA_RI_HOST	3
 #define SUA_RI_SSN_IP	4
 
+/* 3.10.6. SCCP Cause: Cause Type */
 #define SUA_CAUSE_T_MASK	0xff00
 #define SUA_CAUSE_T_RETURN	0x0100
 #define SUA_CAUSE_T_REFUSAL	0x0200

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