We have to spent about US $ 800 per month to  operate four AE offices. (US $ 200 per each VPN)

Each AE office connects with small site three to four site offices. all together one manager office controls 3-4 AE offices and 10-15 site offices.

if we happen to provide VPNs for each site the burden will rise to US $ 2000 I suppose. (excluding the US $ 800 spent for AE office VPNs)

An we use ADSL lines which costs only US $ 5-10 per month.

If the problem is not clear pls ask me again.

Thanks

bye

Rejith