diff --git a/src/ca/cac.cpp b/src/ca/cac.cpp
index 43344a84f..835a1689d 100644
--- a/src/ca/cac.cpp
+++ b/src/ca/cac.cpp
@@ -749,7 +749,7 @@ bool cac::versionAction ( callbackManager &, tcpiiu &,
  
 bool cac::echoRespAction ( 
     callbackManager & mgr, tcpiiu & iiu, 
-    const epicsTime &, const caHdrLargeArray &, void * )
+    const epicsTime & /* current */, const caHdrLargeArray &, void * )
 {
     iiu.probeResponseNotify ( mgr.cbGuard );
     return true;
@@ -911,7 +911,7 @@ bool cac::readRespAction ( callbackManager &, tcpiiu &,
 }
 
 bool cac::clearChannelRespAction ( callbackManager &, tcpiiu &, 
-    const epicsTime &, const caHdrLargeArray &, void * )
+    const epicsTime &, const caHdrLargeArray &, void * /* pMsgBody */ )
 {
     return true; // currently a noop
 }
@@ -1033,7 +1033,7 @@ bool cac::exceptionRespAction ( callbackManager & cbMutexIn, tcpiiu & iiu,
 
 bool cac::accessRightsRespAction (
     callbackManager & mgr, tcpiiu &, // X aCC 431
-    const epicsTime &, const caHdrLargeArray & hdr, void * )
+    const epicsTime &, const caHdrLargeArray & hdr, void * /* pMsgBody */ )
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     nciu * pChan = this->chanTable.lookup ( hdr.m_cid );
@@ -1050,7 +1050,7 @@ bool cac::accessRightsRespAction (
 
 bool cac::createChannelRespAction (
     callbackManager & mgr, tcpiiu & iiu, // X aCC 431
-    const epicsTime &, const caHdrLargeArray & hdr, void * )
+    const epicsTime &, const caHdrLargeArray & hdr, void * /* pMsgBody */ )
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     nciu * pChan = this->chanTable.lookup ( hdr.m_cid );
@@ -1077,7 +1077,7 @@ bool cac::createChannelRespAction (
 
 bool cac::verifyAndDisconnectChan ( 
     callbackManager & mgr, tcpiiu &, 
-    const epicsTime &, const caHdrLargeArray & hdr, void * )
+    const epicsTime &, const caHdrLargeArray & hdr, void * /* pMsgBody */ )
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     nciu * pChan = this->chanTable.lookup ( hdr.m_cid );
@@ -1101,7 +1101,7 @@ void cac::disconnectChannel (
 }
 
 bool cac::badTCPRespAction ( callbackManager &, tcpiiu & iiu, 
-    const epicsTime &, const caHdrLargeArray & hdr, void * )
+    const epicsTime &, const caHdrLargeArray & hdr, void * /* pMsgBody */ )
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     char hostName[64];
diff --git a/src/ca/disconnectGovernorTimer.cpp b/src/ca/disconnectGovernorTimer.cpp
index 29d538806..05b461965 100644
--- a/src/ca/disconnectGovernorTimer.cpp
+++ b/src/ca/disconnectGovernorTimer.cpp
@@ -63,7 +63,7 @@ void disconnectGovernorTimer::shutdown (
 }
 
 epicsTimerNotify::expireStatus disconnectGovernorTimer::expire ( 
-    const epicsTime & ) // X aCC 361
+    const epicsTime & /* currentTime */ ) // X aCC 361
 {
     epicsGuard < epicsMutex > guard ( this->mutex );
     while ( nciu * pChan = chanList.get () ) {
diff --git a/src/ca/netiiu.cpp b/src/ca/netiiu.cpp
index afd30b397..2e855a633 100644
--- a/src/ca/netiiu.cpp
+++ b/src/ca/netiiu.cpp
@@ -154,15 +154,15 @@ double netiiu::receiveWatchdogDelay (
 
 void netiiu::uninstallChanDueToSuccessfulSearchResponse ( 
     epicsGuard < epicsMutex > &, nciu &, 
-    const epicsTime & )
+    const epicsTime & currentTime )
 {
     throw std::runtime_error ( 
         "search response occured when not attached to udpiiu?" );
 }
 
 bool netiiu::searchMsg (
-    epicsGuard < epicsMutex > &, ca_uint32_t, 
-        const char *, unsigned )
+    epicsGuard < epicsMutex > &, ca_uint32_t /* id */, 
+    const char * /* pName */, unsigned /* nameLength */ )
 {
     return false;
 }
diff --git a/src/ca/udpiiu.cpp b/src/ca/udpiiu.cpp
index dd5dccc7f..a61f75c41 100644
--- a/src/ca/udpiiu.cpp
+++ b/src/ca/udpiiu.cpp
@@ -599,7 +599,7 @@ bool udpiiu::badUDPRespAction (
 }
 
 bool udpiiu::versionAction ( epicsGuard < epicsMutex > &,
-    const caHdr & hdr, const osiSockAddr &, const epicsTime & )
+    const caHdr & hdr, const osiSockAddr &, const epicsTime & /* currentTime */ )
 {
     epicsGuard < epicsMutex > guard ( this->cacMutex );
 
@@ -724,7 +724,7 @@ bool udpiiu::beaconAction (
 }
 
 bool udpiiu::repeaterAckAction ( 
-    epicsGuard < epicsMutex > &, const caHdr &,  
+    epicsGuard < epicsMutex > & /* cbGuard */, const caHdr &,  
     const osiSockAddr &, const epicsTime &)
 {
     this->repeaterSubscribeTmr.confirmNotify ();
@@ -892,7 +892,7 @@ bool udpiiu::pushDatagramMsg ( epicsGuard < epicsMutex > & guard,
 }
 
 bool udpiiu::datagramFlush ( 
-    epicsGuard < epicsMutex > &, const epicsTime & )
+    epicsGuard < epicsMutex > &, const epicsTime & /* currentTime */ )
 {
     // dont send the version header by itself
     if ( this->nBytesInXmitBuf <= sizeof ( caHdr ) ) {