Hi Slick,
Pretty straight forward, use the VOXILLA device config wizard for configuring both the Line 1 and PSTN of the SPA 3K. Some changes you need to do is in the FXO port impedance for that check this thread
http://voxilla.com/PNphpBB2-viewtopi...ght-india.html.
Do a search in the forum there is a quiet a bit information for India/Pakistan settings
Meanwhile in-case if you are interested in setting this up in South India, i can give you a contact in chennai who can set this up for you at a nominal fee. He helped with setting it up at my parents place. If you PM me, i can give you his contact information.