diff --git a/library/Osmocom_Types.ttcn b/library/Osmocom_Types.ttcn
index a748bbc..a736e95 100644
--- a/library/Osmocom_Types.ttcn
+++ b/library/Osmocom_Types.ttcn
@@ -1,4 +1,7 @@
 module Osmocom_Types {
+
+	import from General_Types all;
+
 	type integer uint8_t (0..255) with { variant "unsigned 8 bit" };
 	type integer uint16_t (0..65535) with { variant "unsigned 16 bit" };
 	type integer uint24_t (0..16777215) with { variant "unsigned 24 bit" };
@@ -66,4 +69,30 @@
 		T.timeout;
 	}
 
+function bool2bit(boolean inp) return BIT1 {
+	if (inp) {
+		return '1'B;
+	} else {
+		return '0'B;
+	}
+}
+
+function bool2bit_tmpl(template boolean inp) return template BIT1 {
+	if (istemplatekind(inp, "omit")) {
+		return omit;
+	} else if (istemplatekind(inp, "*")) {
+		return *;
+	} else if (istemplatekind(inp, "?")) {
+	} else {
+		if (valueof(inp)) {
+			return '1'B;
+		} else {
+			return '0'B;
+		}
+	}
+	setverdict(fail, "Unsupported template");
+	self.stop;
+}
+
+
 } with { encode "RAW"; variant "FIELDORDER(msb)" }