diff --git a/Control/L3MobilityManagement.cpp b/Control/L3MobilityManagement.cpp
index 7a6fbc8..6ac5b81 100644
--- a/Control/L3MobilityManagement.cpp
+++ b/Control/L3MobilityManagement.cpp
@@ -724,7 +724,7 @@ MachineStatus LUAuthentication::machineRunState(int state, const GSM::L3Message*
 			} else
 #endif
 			{
-				string SRESstr = format("%x",mobileSRES);
+				string SRESstr = format("%08x",mobileSRES);
 				return machPush(new L3RegisterMachine(tran(),SIPDTRegister,
 														SRESstr, &ludata()->mRegistrationResult),
 								stateRegister2Response);
diff --git a/SIP/SIPBase.cpp b/SIP/SIPBase.cpp
index 4213c73..a3d01a2 100644
--- a/SIP/SIPBase.cpp
+++ b/SIP/SIPBase.cpp
@@ -493,7 +493,7 @@ SipMessage *SipBase::makeRegisterMsg(DialogType wMethod, const L3LogicalChannel*
 		if (SRES && strlen(SRES)) {
 			if (realm.length() > 0) {
 				string response = makeResponse(authUsername, realm, SRES, registerStr, authUri, RAND);
-				msg->msmAuthorizationValue = format("Digest realm=\"%s\", username=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\", algorithm=MD5, qop=\"auth\" ",
+				msg->msmAuthorizationValue = format("Digest realm=\"%s\", username=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\", algorithm=MD5 ",
 					realm.c_str(), authUsername.c_str(), RAND.c_str(), authUri.c_str(), response.c_str());
 			} else {
 				msg->msmAuthorizationValue = format("Digest, nonce=%s, uri=%s, response=%s",RAND.c_str(),msid.mImsi.c_str(),SRES);