Hi. There is no way to convert a T1 card to E1 card without changing the cards, but you can translate T1 E1 with RAD equipment, although you will loose some channels. See http://www.rad.com
If you’re in Iran you need to be carefuk with RAD equipment it’s made in Israel.
I heard some people are able to convert T1’s to E1’s by using some software image, but I don’t know how. If you find out a solution, please let me know. I’m also interested.