If you have a device running RouterOS which has a PCI slot then you can use one of the ADSL cards we sell.
http://linitx.com/product/12181 - currently out of stock, but we are getting some more.
This card appears as a realtek interface with an adsl router attached to it so you simply add a dhcp client to it and then
connect to the card's web interface to configure it like any separate ADSL modem.
We have also talked to MikroTik about ADSL inside their products, as there is still a huge demand for it in the UK, but again they didn't seem very interested.
Nick.