Hello Guys,
This is Tushar. Working as Network Engineer. I have one private network at our office. And our branch office is at Bangalore. Our main office is connected to internet traffic with the help of D-link ADSL wireless router while branch office conectd to internet with the help of huawei adsl modem. I wanted to connected these two offices together over WAN traffic without help of VPN and Remote Access server. Instead I wanted make use of ADSL Routers.
Please suggest me some solutions.

Thanks

A simple method does not exist unless the ADSL router also has VPN features built in.
This is due to the dynamic address on the outside of the adsl router.
You can use an external service like Positive Networks or buy a used appliance like a watchguard firebox or Cisco PIX on Ebay and come back here for configuration help.
Or replace your ADSL routers with a pair with VPN support.
Yodatech
(James Yearnd)

Yodatech is correct! Always make sure you are ensuring your security. If you plan to look at VOIP in the future between sites, I would also look at routers that are capable of handling QoS on the VPN connection. If you want price and features, you may also want to look at Kentrox for your routing solution. I know, I know, you can't go wrong with Cisco. However, I have used the Kentrox for several smaller customers in your situation. Just hope tis helps some more.