Connecting a TA to an ISDN Router

Hi,

I wish connect to my office LAN through a Cisco 775 IDSN Router from my home using a Zyxel Omni.net plus TA. What settings do I need to make in the router to authenticate the connection (although I dont need any authentication as I am the only user)and provide access to the office LAN ?

Thanx,

Anil
aktayal@vsnl.com