diff --git a/gprs_gb/GPRS_Context.ttcn b/gprs_gb/GPRS_Context.ttcn
new file mode 100644
index 0000000..af2b2e9
--- /dev/null
+++ b/gprs_gb/GPRS_Context.ttcn
@@ -0,0 +1,12 @@
+module GPRS_Context {
+
+import from Osmocom_Types all;
+import from GSM_Types all;
+
+	type record MmContext {
+		hexstring	imsi optional,
+		GprsTlli	tlli,
+		uint9_t		n_u
+	};
+
+}