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-rw-r--r--common/chapters/gsup.adoc4
1 files changed, 4 insertions, 0 deletions
diff --git a/common/chapters/gsup.adoc b/common/chapters/gsup.adoc
index c48209d..7773d09 100644
--- a/common/chapters/gsup.adoc
+++ b/common/chapters/gsup.adoc
@@ -219,6 +219,10 @@ shall be sent in the given order. Nevertheless after the generic part the
receiver shall be able to received them in any order. Unknown IE shall be
ignored.
+Besides a numeric range, the 'presence' column may have 'M' (Mandatory), 'O'
+(Optional) or 'C' (Conditional). The 'format' column holds either 'V' (Value)
+or 'TLV' (Tag Length Value).
+
==== Send Authentication Info Request
Direction: SGSN / VLR => HLR