add TS 25.412 spec
diff --git a/specs/by_chapter/25.412.pdf b/specs/by_chapter/25.412.pdf
new file mode 120000
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+++ b/specs/by_chapter/25.412.pdf
@@ -0,0 +1 @@
+../files/ts_125412v120000p.pdf
\ No newline at end of file
diff --git a/specs/by_name/iu_signalling_transport.pdf b/specs/by_name/iu_signalling_transport.pdf
new file mode 120000
index 0000000..9acbf56
--- /dev/null
+++ b/specs/by_name/iu_signalling_transport.pdf
@@ -0,0 +1 @@
+../files/ts_125412v120000p.pdf
\ No newline at end of file
diff --git a/specs/files/ts_125412v120000p.pdf b/specs/files/ts_125412v120000p.pdf
new file mode 100644
index 0000000..8e38af6
--- /dev/null
+++ b/specs/files/ts_125412v120000p.pdf
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