Hello,
I stay in the US and want to setup VOIP at my home in hyderabad. Can somebody please advice me on how I can set this up? Are there any agencies who can setup this up at my place or do I need to buy something from here and send it to india? Please let me know.
Thanks.

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You can open two VoIP accounts with CallCentric. Creating VoiP accounts is free. They have a free downloadable Softphone that installs on PC's. All calls are free between account holders.
Buy two Linksys SPA2102-NA VoIP adapters (ATA's - Analog Telephone Adapters) from VoIP Supply in USA. Ask them if they can pre-configure your VoIP accounts into each adapter. (or, configure them yourself, if you can learn how, like I did.) Once configured with your CallCentric SIP VoIP account login information, you can call between the VoiP adapters from anywhere in the world, for free. Calls to landlines is very low rates.
No contracts, no commitments, no gimmicks.