In answer to viewing the Bosch Divar 2 via your iPhone, or any other smart phone app, no this is not possible.
You are correct, Active X is a Microsoft product and is not supported by Apple (these companies share nothing). You need a product that supports RTSP protocols. This is a video streaming application that most smart phones do support. Unfortunately for you, when you purchased the Divar 2 unit, smart phone apps were not available and thus you can not get this product to do what you are after. Bosch has moved along and no longer supports the Divar 2 products, so there is no Firmware or Software upgrades that will give you what you are after.
However, there are alternative solutions out there that allow video streaming on any product. I do not know what it is call but most IP companies should know of it. This product is a loop in/loop out product, therefore you will be looking at your analogue cameras directly over the network and not at the DVR. Alternatively, Bosch and others do now sell a various array of new products capable of achieving your desired outcome. As they say, my '67 Mustang doesn't have power steering...You need to buy, to upgrade.
Hope this helps.....