Adding a VoIP phone to winmobile, and disabling default windows mo

[usva.techdev]

Hi,

I'm trying to add my own VoIP phone to WinMobile.

Reading over the docs I found that TAPI provides the ability to register new
TSP for VoIP as stated in
http://msdn.microsoft.com/en-us/library/aa454154%28classic%29.aspx
Registering that new TSP is done through calling lineInitializeEx, and then
lineAddProvider. Additionally I will have to create TSPI dll

However, I'm getting confused because it seems like I have to talke to a
modem, which doesn't make sense to me since I want to use internet connection
for voice transfer. It also says that TSP is the driver to the hardware.
In this web page http://msdn.microsoft.com/en-us/library/aa922068.aspx says
that "TAPI application programming interface to establish a modem connection."

so i have the following question:

1.- Could anyone confirm that adding a TSP through, lineAddProvider, is the
correct way to add my VoIP phone to windows mobile?
If it is not, could you please tell which other options I have.?

2.- If TAPI and TSP is not the option then I would like to disable the
default windows mobile dialer, to handle all incoming and outgoing calls from
my VoIP applicaction, any idea on how to do this?

Thanks, I appreciate all of your help.

Ulises Vega.