code: public Wrapper remove(SipActivityHandle handle) {
  		final Wrapper activity = handle.getActivity();
  		handle.setActivity(null);
  		return activity;
  	}
docs: /*
  (non-Javadoc)
  @see org.mobicents.slee.resource.sip11.SipActivityManagement#remove(org.mobicents.slee.resource.sip11.SipActivityHandle)