code: public Address getEventFiringAddress() {
          if (eventFiringAddress == null) {
              eventFiringAddress = new Address(AddressPlan.SIP,
                      ((ToHeader) wrappedTransaction.getRequest().getHeader(ToHeader.NAME))
                      .getAddress().toString());
          }
          return eventFiringAddress;
      }
docs: /*
  (non-Javadoc)
  @see org.mobicents.slee.resource.sip11.wrappers.WrapperSuperInterface#getEventFiringAddress()