made the terminate dialog on transaction termination optional.

Related to issue usnistgov #8

src/gov/nist/javax/sip/stack/SIPClientTransaction.java

@@ -226,4 +226,11 @@ public abstract void processResponse(SIPResponse transactionResponse,
    * @return the originalRequestFromTag
    */
   public abstract String getOriginalRequestScheme();
+
+  /**
+   * will terminate a null state dialog when the transaction terminates 
+   * Default: true
+   * @param enabled
+   */
+  public abstract void setTerminateDialogOnCleanUp(boolean enabled);
 }

src/gov/nist/javax/sip/stack/SIPClientTransactionImpl.java

@@ -230,6 +230,8 @@ public class SIPClientTransactionImpl extends SIPTransactionImpl implements SIPC
   private AtomicBoolean timerKStarted = new AtomicBoolean(false);
   private boolean transactionTimerCancelled = false;
   private Set<Integer> responsesReceived = new CopyOnWriteArraySet<Integer>();
+
+  private boolean terminateDialogOnCleanUp = true;
 
   public class TransactionTimer extends SIPStackTimerTask {
 
@@ -1966,10 +1968,12 @@ protected void cleanUpOnTerminated() {
       // }
     }
 
-    // If dialog is null state, no response is received and we should clean it up now, 
-    // it's hopeless to recover. Refers to this issue https://github.com/usnistgov/jsip/issues/8
-    if(this.defaultDialog != null && this.defaultDialog.getState() == null) {
-    	this.defaultDialog.setState(SIPDialog.TERMINATED_STATE);
+    if (terminateDialogOnCleanUp) {
+      // If dialog is null state, no response is received and we should clean it up now, 
+      // it's hopeless to recover. Refers to this issue https://github.com/usnistgov/jsip/issues/8
+      if(this.defaultDialog != null && this.defaultDialog.getState() == null) {
+      	this.defaultDialog.setState(SIPDialog.TERMINATED_STATE);
+      }
     }
 
   }
@@ -2029,4 +2033,11 @@ public String getOriginalRequestScheme() {
     return originalRequest.getRequestURI().getScheme();
   }
 
+  /**
+   * @see gov.nist.javax.sip.stack.SIPClientTransaction#setTerminateDialogOnCleanUp(boolean)
+   */
+  public void setTerminateDialogOnCleanUp(boolean enabled) {
+    terminateDialogOnCleanUp = enabled;
+  }
+
 }