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GSUP: add missing Current RAT Type IE

This IE has been introduced here:
https://gerrit.osmocom.org/c/libosmocore/+/12452

Used only by osmo_dia2gsup so far:
https://gitea.osmocom.org/erlang/osmo_dia2gsup/commit/388d387dcc9a565b82c709d3b290c734a64ff2a7

Change-Id: Iba841856806b7dbd4b6aa3675e0cc6dff2485da0
---
M common/chapters/gsup.adoc
1 file changed, 15 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/18/41518/1

diff --git a/common/chapters/gsup.adoc b/common/chapters/gsup.adoc
index 33d35da..46139f8 100644
--- a/common/chapters/gsup.adoc
+++ b/common/chapters/gsup.adoc
@@ -363,6 +363,7 @@
 |26|AUTS|<<gsup-ie-auts>>|C|TLV|18
 |20|RAND|<<gsup-ie-rand>>|C|TLV|18
 |05|PDP info|<<gsup-ie-pdpinfo>>|C|TLV|2-N
+|2a|Current RAT Type|<<gsup-ie-current-rat-type>>|O|TLV|3
 |===
 
 The conditional 'AUTS' and 'RAND' IEs are both present in case the SIM
@@ -1736,6 +1737,20 @@
 This IE indicates why an event is happening on the BSSAP interface. See 3GPP TS
 48.008 3.2.2.5 for reference.
 
+[[gsup-ie-current-rat-type]]
+==== Current RAT Type
+
+This IE contains the current RAT Type.
+
+.Current RAT Type values
+[options="header",cols="15%,85%"]
+|===
+|Type|Description
+|0x01|GERAN
+|0x02|UTRAN
+|0x03|EUTRAN
+|===
+
 [[gsup-ie-cause-sm]]
 ==== Session Management Cause
 

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