MILLION DOLLAR SERVER: Windows Mobile Set SIP Phone

http://www.vsure.org/blog/article.asp?id=113

For example your T-Mobile Dash, T-Mobile Wing GSM Cellular, HTC S630, HTC TyTN II, HP iPAQ, etc.

The WM6 OS generic version has the ability to be configured to make VOIP calls. But many providers remove this option, not wanting to encourage VOIP use on their network.

Check if the VoIP is support is present in your ROM, as some cooks have removed them from the ROM.
so look for the Internet Calling today item as well as for the following files from the packages VoIP and VoIPOS in the Windows directory:

ipdialplan.xml
dnsapi.dll
voipphonecanvas.dll
rtcdll.dll

If you don't have Internet Calling support in your ROM download the follow cab and install to your rom.
http://brujula.net/windows-mobile/wm6voip.cab
http://brujula.net/windows-mobile/sipconfigtool200.cab

You can however put it back by installing the WM6 VOIP cab file and then a SIP configuration tool to enable you to enter your own SIP provider.

http://fonosip.com/english/wm6_smartphone.html

There is a default dial plan setting in ipdialplan.xml,
It auto add a '9' when you dial 11 or 10 number. So if you using vbuzzer voip service, it can not call out.
You can change the dial plan by edit ipdialplan.xml,

for example:

dial='sip:91123@$host$'
display='1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:91123@$host$'
display='1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:91123@$host$'
display='+1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:91123@$host$'
display='+1 (1) 2-3'
transfer='sip:1123@$host$'
/>
chang to (just remove the '9')

dial='sip:1123@$host$'
display='1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:1123@$host$'
display='1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:1123@$host$'
display='+1 (1) 2-3'
transfer='sip:1123@$host$'
/>

dial='sip:1123@$host$'
display='+1 (1) 2-3'
transfer='sip:1123@$host$'
/>
**********************************************************************************
and also :

dial='sip:9123@$host$'
display='(1) 2-3'
transfer='sip:123@$host$'
/>

dial='sip:9123@$host$'
display='(1) 2-3'
transfer='sip:123@$host$'
/>

change to (when dial 10 number auto add 1 )

dial='sip:1123@$host$'
display='(1) 2-3'
transfer='sip:123@$host$'
/>

dial='sip:1123@$host$'
display='(1) 2-3'
transfer='sip:123@$host$'
/>

A guide for configuring and Unlocking your Windows Mobile 6 Smartphone

For example your T-Mobile Dash, T-Mobile Wing GSM Cellular, HTC S630, HTC TyTN II, HP iPAQ, etc.
The WM6 OS generic version has the ability to be configured to make VOIP calls. But many providers remove this option, not wanting to encourage VOIP use on their network.
You can however put it back by installing the WM6 VOIP cab file and then a SIP configuration tool to enable you to enter your own SIP provider.

Fill in the SIP Configurator with the following info:

User: your_sip_number
Password: your_password
SIP Proxy: fonosip.com
Use Outbound Proxy: No
Stun Server: stun.fonosip.com

Once you have everything configured you can make a call, but remember you need to be connected over Wi Fi - you can make calls over 3G if your phone supports it, but to do this you will need to enable it via your SIP Conf Tool by going to Tools > Sip Over 3g/Gsm > Enable Via Reg.

Fring

As an option you can use Fring. It is a gateway program that allows users to make free VoIP phone calls from a Windows Mobile 6 phone. Fring also allows multiple live chat sessions through Skype, Google Talk, MSN Messenger, and SIP