Hello Lakshmi,

It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. I have been looking into your post and I suggest you see these links:

http://forums.silverlight.net/t/237111.aspx/1

where there are suggestions on how to use Fax with Silverlight.

Feel free to write me if you have further questions.