Hi:

I am thinking of creating a "dedicated personal VoIP network" to
connect my parent's home phone (in India) with mine in Canada. I have
a very little knowledge about the VoIP technology, but after a brief
research, my undersatnding about the architechture of the VoIP is as
below:

phone-->PC-->gateway-->internet-->gateway-->PC-->phone
<==== Canada ====> <===== India =====>

To install the system, I may need following components in both
locations:

1) Each PC (Windows XP) at both locations should have:
a) Network card connected to internet services;
b) Gatekeeper and Call Processing software been installed and
running;
c) Phone line from wall is connected to the RJ11 port (line);
d) Phone is connected to the RJ11 port (phone);
2) Each Gateway (either PCI card or modem like box) connected to the
PC at one side and other to the internet (either through modem or
home
network router).

Now, I have questions and need your suggestions:

1) What Gatekeeper and Call Processing software should I use ? (I
prefer open source and free).
2) Where can I buy a good "Gateway" (PCI card or modem like box) ?
3) Do I need any management software installed in the PC (for
configuration) ?