Hi, Thanks.
It worked now. SEF working now.

Our website url - biscuitmanufacturer.com .

I enabled SEF in this website, but I saw no SEF URLs in - Manage SEF URL section.

When I try to activate SEF, it does not take effect, and Basic SEF of JOOMLA takes effect with index.php suffix in between of URL.
e.g. biscuitmanufacturer.com/index.php/company-profile


So, finally I had to avoid using JOOMSEF Component for this website and I activated BASIC SEF of Joomla 2.5 from Glabal Configuration page by turning all following options to YES.

SEO Settings

Search Engine Friendly URLs Yes
Use URL rewriting Yes
Adds Suffix to URL Yes