How to connect an Astak 4 cameras DVR with a Thomson Speedtouch 780 WL modem

[skywalker66]

Please, I'm new in the DVR surveillance topic and need help to set up my Astak 4 cameras DVR with my Thomson Speedtouch 780 WL modem, in my home. I have a DSL internet connection. I want to see the cameras from my job and from my Iphone. I use the dvr cd setup but this do not explain how to be connected to my modem model. I don't know if I need a router, because I think the Speedtouch is modem and router too. I can connect my laptop and Iphone via wireless to the modem. I have dynamic ip on my pc and setup dyndns to find an ip name. Does anyone know how to connect this items?
Thanks for the help!!