[reSIProcate] Bug in error handling / reSUBSCRIBE case for ClientSubscription

[aron_rosenberg at logitech.com]

In a number of places in ClientSubscription.cxx, the class will
automatically invoke dum.makeSubscription to create a new subscription if
the current one is failed. One such place is

   else if (!mEnded &&
            msg.header(h_StatusLine).statusCode() == 481 &&
            msg.exists(h_Expires) && msg.header(h_Expires).value() > 0)
   {
      InfoLog (<< "Received 481 to SUBSCRIBE, reSUBSCRIBEing (presence
server probably restarted) "
               << mLastRequest->header(h_To));

      SharedPtr<SipMessage> sub = mDum.makeSubscription(mLastRequest->
header(h_To), getUserProfile(), getEventType(), getAppDialogSet()->reuse
());
      mDum.send(sub);

      delete this;
      return;
   }

This is the 481 dialog doesn't exist case. In this case, dum is properly
building a new SUBSCRIBE message, but the new SUBSCRIBE message/dialog
starts out with a populated ToTag. The presence server then rejects this
new dialog since a ToTag must start empty. The new request has a different
Call-Id, from tag, branch tag/via, but the ToTag is the same as the
previous failed request

My hunch is that passing in h_To is causing the old ToTag to get copied to
the new request, but I am not sure what the proper fix is... I already
tried removing the getAppDialogSet()->reuse() param but it didn't have any
affect.

I have a test case setup for this with our presence server so I can try
various patches.

-Aron

Aron Rosenberg
Logitech Inc, (SightSpeed Group)
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