diff --git a/src/ca/hostNameCache.h b/src/ca/hostNameCache.h
index b29def436..9fbb6a0fc 100644
--- a/src/ca/hostNameCache.h
+++ b/src/ca/hostNameCache.h
@@ -39,14 +39,15 @@
 #   define epicsExportSharedSymbols
 #endif
 
-class hostNameCache : public ipAddrToAsciiAsynchronous {
+class hostNameCache : public ipAddrToAsciiCallBack {
 public:
     hostNameCache ( const osiSockAddr &addr, ipAddrToAsciiEngine &engine );
     ~hostNameCache ();
     void destroy ();
-    void ioCompletionNotify ( const char *pHostName );
+    void transactionComplete ( const char * pHostName );
     void hostName ( char *pBuf, unsigned bufLength ) const;
 private:
+    ipAddrToAsciiTransaction & dnsTransaction;
     bool ioComplete;
     char hostNameBuf [128];
 };
diff --git a/src/ca/msgForMultiplyDefinedPV.cpp b/src/ca/msgForMultiplyDefinedPV.cpp
index 83ba2c03b..27c936667 100644
--- a/src/ca/msgForMultiplyDefinedPV.cpp
+++ b/src/ca/msgForMultiplyDefinedPV.cpp
@@ -38,9 +38,10 @@
 #undef epicsExportSharedSymbols
 
 msgForMultiplyDefinedPV::msgForMultiplyDefinedPV ( 
-    callbackForMultiplyDefinedPV & cbIn, const char * pChannelName, 
-    const char * pAcc, const osiSockAddr &rej ) :
-    ipAddrToAsciiAsynchronous ( rej ), cb ( cbIn )
+    ipAddrToAsciiEngine & engine,
+    callbackForMultiplyDefinedPV & cbIn, 
+    const char * pChannelName, const char * pAcc ) :
+    dnsTransaction ( engine.createTransaction () ), cb ( cbIn )
 {
     strncpy ( this->acc, pAcc, sizeof ( this->acc ) );
     this->acc[ sizeof ( this->acc ) - 1 ] = '\0';
@@ -48,11 +49,15 @@ msgForMultiplyDefinedPV::msgForMultiplyDefinedPV (
     this->channel[ sizeof ( this->channel ) - 1 ] = '\0';
 }
 
-void msgForMultiplyDefinedPV::ioCompletionNotify ( const char * pHostNameRej )
+msgForMultiplyDefinedPV::~msgForMultiplyDefinedPV ()
+{
+    this->dnsTransaction.release ();
+}
+
+void msgForMultiplyDefinedPV::transactionComplete ( const char * pHostNameRej )
 {
     this->cb.pvMultiplyDefinedNotify ( *this, this->channel, this->acc, pHostNameRej );
-    // dont touch this pointer after cb interfaces is called above because 
-    // this object may no-longer exist!
+    // !! dont touch this pointer after this point because object has been deleted !!
 }
 
 void * msgForMultiplyDefinedPV::operator new ( size_t size, 
diff --git a/src/ca/msgForMultiplyDefinedPV.h b/src/ca/msgForMultiplyDefinedPV.h
index e029b08f9..a452d2c02 100644
--- a/src/ca/msgForMultiplyDefinedPV.h
+++ b/src/ca/msgForMultiplyDefinedPV.h
@@ -39,22 +39,31 @@ public:
         const char * pAcc, const char * pRej ) = 0;
 };
 
-class msgForMultiplyDefinedPV : public ipAddrToAsciiAsynchronous {
+class msgForMultiplyDefinedPV : public ipAddrToAsciiCallBack {
 public:
-    msgForMultiplyDefinedPV ( callbackForMultiplyDefinedPV &, 
-        const char * pChannelName, const char * pAcc, const osiSockAddr & rej );
+    msgForMultiplyDefinedPV ( ipAddrToAsciiEngine & engine,
+        callbackForMultiplyDefinedPV &, const char * pChannelName, 
+        const char * pAcc );
+    virtual ~msgForMultiplyDefinedPV ();
+    void ioInitiate ( const osiSockAddr & rej );
     void * operator new ( size_t size, tsFreeList < class msgForMultiplyDefinedPV, 16 > & );
     epicsPlacementDeleteOperator (( void *, tsFreeList < class msgForMultiplyDefinedPV, 16 > & ))
 private:
     char acc[64];
     char channel[64];
+    ipAddrToAsciiTransaction & dnsTransaction;
     callbackForMultiplyDefinedPV & cb;
-    void ioCompletionNotify ( const char *pHostName );
+    void transactionComplete ( const char * pHostName );
 	msgForMultiplyDefinedPV ( const msgForMultiplyDefinedPV & );
 	msgForMultiplyDefinedPV & operator = ( const msgForMultiplyDefinedPV & );
     void * operator new ( size_t size );
     void operator delete ( void * );
 };
 
+inline void msgForMultiplyDefinedPV::ioInitiate ( const osiSockAddr & rej )
+{
+    this->dnsTransaction.ipAddrToAscii ( rej, *this );
+}
+
 #endif // ifdef msgForMultiplyDefinedPVh