Fixes some NPE when sip presence is disabled.

src/net/java/sip/communicator/impl/protocol/sip/CallPeerSipImpl.java

@@ -360,7 +360,10 @@ public Contact getContact()
             = (OperationSetPresenceSipImpl) pps
                 .getOperationSet(OperationSetPresence.class);
 
-        return opSetPresence.resolveContactID(getAddress());
+        if(opSetPresence != null)
+            return opSetPresence.resolveContactID(getAddress());
+        else
+            return null;
     }
 
     /**

src/net/java/sip/communicator/impl/protocol/sip/OperationSetBasicTelephonySipImpl.java

@@ -1298,10 +1298,12 @@ private void processRefer(ServerTransaction serverTransaction,
                     (OperationSetPresenceSipImpl) protocolProvider
                         .getOperationSet(OperationSetPersistentPresence.class);
 
-            Contact from = opSetPersPresence.resolveContactID(
-                fromHeader.getAddress().getURI().toString());
+            Contact from = null;
+            if(opSetPersPresence != null)
+                from = opSetPersPresence.resolveContactID(
+                    fromHeader.getAddress().getURI().toString());
 
-            if (from == null)
+            if (from == null && opSetPersPresence != null)
             {
                 if (logger.isDebugEnabled())
                     logger.debug("received a message from an unknown contact: "
@@ -1313,8 +1315,17 @@ private void processRefer(ServerTransaction serverTransaction,
 
             // found no call we must authorise this with user
             // if user don't want it, decline it.
-            if(!transferAuthority.processTransfer(
-                    from, referToAddress.getURI().toString()))
+            boolean allowTransfer;
+
+            if(from != null)
+                allowTransfer = transferAuthority.processTransfer(
+                                    from, referToAddress.getURI().toString());
+            else
+                allowTransfer = transferAuthority.processTransfer(
+                                    fromHeader.getAddress().getURI().toString(),
+                                    referToAddress.getURI().toString());
+
+            if(!allowTransfer)
             {
                 // send decline
                 Response declineResponse;

src/net/java/sip/communicator/service/protocol/TransferAuthority.java

@@ -23,4 +23,15 @@ public interface TransferAuthority
      * otherwise.
      */
     public boolean processTransfer(Contact fromContact, String transferTo);
+
+    /**
+     * Checks with user for unknown transfer. Returns <tt>true</tt> if user
+     * accepts and we must process the transfer, <tt>false</tt> otherwise.
+     *
+     * @param fromAddress the address initiating the transfer.
+     * @param transferTo the address we will be transferred to.
+     * @return <tt>true</tt> if transfer is allowed to process, <tt>false</tt>
+     * otherwise.
+     */
+    public boolean processTransfer(String fromAddress, String transferTo);
 }