diff --git a/library/IPA_Emulation.ttcnpp b/library/IPA_Emulation.ttcnpp
index a271f2d..b10a983 100644
--- a/library/IPA_Emulation.ttcnpp
+++ b/library/IPA_Emulation.ttcnpp
@@ -239,7 +239,7 @@
 private template IpaCcmRespPart t_IdRespPart(IpaCcmIdTag tag, charstring payload) := {
 	len := 0,	/* overwritten by codec */
 	tag := tag,
-	data := payload
+	data := char2oct(payload) & '00'O
 }
 
 private function f_send_IPA_EVT(template ASP_IPA_Event evt) runs on IPA_Emulation_CT {
diff --git a/library/IPA_Types.ttcn b/library/IPA_Types.ttcn
index 933a3fe..3230329 100644
--- a/library/IPA_Types.ttcn
+++ b/library/IPA_Types.ttcn
@@ -98,7 +98,7 @@
 type record IpaCcmRespPart {
 	uint16_t	len,
 	IpaCcmIdTag	tag,
-	charstring	data
+	octetstring	data
 } with { variant (len) "LENGTHTO(data,tag)" }
 type set of IpaCcmRespPart IpaCcmIdResp;