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GTP_Emulation: SGSN_ContextRequest: Fix unconditional access to optional field IMSI

Change-Id: I0721f25deeae822150a39e52916b8bf272de21ee
---
M library/GTP_Emulation.ttcn
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/library/GTP_Emulation.ttcn b/library/GTP_Emulation.ttcn
index 6297c4f..689fb0d 100644
--- a/library/GTP_Emulation.ttcn
+++ b/library/GTP_Emulation.ttcn
@@ -134,7 +134,11 @@
 	} else if (ischosen(gtp.gtpc_pdu.identificationResponse) ){
 		return gtp.gtpc_pdu.identificationResponse.imsi.digits;
 	} else if (ischosen(gtp.gtpc_pdu.sgsn_ContextRequest)) {
-		return gtp.gtpc_pdu.sgsn_ContextRequest.imsi.digits;
+		if (ispresent(gtp.gtpc_pdu.sgsn_ContextRequest.imsi.digits)) {
+			return gtp.gtpc_pdu.sgsn_ContextRequest.imsi.digits;
+		} else {
+			return omit;
+		}
 	} else if (ischosen(gtp.gtpc_pdu.sgsn_ContextResponse)) {
 		if (ispresent(gtp.gtpc_pdu.sgsn_ContextResponse.imsi.digits)) {
 			return gtp.gtpc_pdu.sgsn_ContextResponse.imsi.digits;

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