BayanDSL supplies an all-in-one WiFi Router/Modem device for at least some of its home DSL subscribers. It is a rebranded ZTE VX10 W300S. Although the built-in WiFi router is adequate, I find that it is a little underpowered and has some dead spots around the house. Additionally, the modem seems to have problems with more than 5 or 6 WiFi clients are online.
This post is a guide to setting the BayanDSL router-modem to bridge mode, to allow the use of a separate WiFi router. I will not be discussing the selection of the separate WiFi router here, that will depend on your specific needs. I also assume that you have enough technical know-how to know why you need bridge mode, how to set a static IP on your PC, and how to setup your WiFi router once the modem is in bridge mode.