Their site has "internal site search" feature. So I thought of searching for "Directory" word in their site search and guess what I found out ?
I found out that they are using SiteSearchASP.net services for their internal site search. But the bigger surprise is that they are running out of the licence to run this service. So if you try to search anything you will get this message (image above). I wonder if they know about this or not.
But anyways, I strongly believe that they should provide some sort of telephone directory access to public/their customers.
If anyone of you knows about some site/feature which provide this information, please post your comment here.
BSNL already has the directory online. BSNL Directory Online has feature where you can search by telephone number or by name. Just click on the link above and select the state you want to search the number for. Once you select the state, you can select district information and search by number or name. Its pretty slick.
MTNL also provides directory services for its metros.
Updates: This is not a directory service. REMEMBER There is no directory services available for Tata Phones. You can not get address/name information from a phone number. That is a privacy issue, and Telephone operators like Tata, Reliance etc. don't release this kind of information to the public.
PLEASE don't put your personal email addresses and cellphone numbers here asking the address/name information. This site will not be responsible for the misuse of the information provided by you.
I do want to help you out and if I will get more information about any kind of directory for Tata Phones, I will post it here. Thanks for visiting.