使用wm6自带的voip功能

Windows Mobile 6

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:
<!-- 11-digits rules -->
<rule pattern='1\s*-?\s*(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:91\1\2\3@$host$'
display='1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='1\s*-?\s*\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:91\1\2\3@$host$'
display='1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='\+\s*1\s*-?\s*(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:91\1\2\3@$host$'
display='+1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='\+\s*1\s*-?\s*\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:91\1\2\3@$host$'
display='+1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
chang to (just remove the '9')
<!-- 11-digits rules -->
<rule pattern='1\s*-?\s*(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='1\s*-?\s*\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='\+\s*1\s*-?\s*(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='+1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
<rule pattern='\+\s*1\s*-?\s*\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='+1 (\1) \2-\3'
transfer='sip:1\1\2\3@$host$'
/>
**********************************************************************************
and also :
<!-- 10-digits rules -->
<rule pattern='(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:9\1\2\3@$host$'
display='(\1) \2-\3'
transfer='sip:\1\2\3@$host$'
/>
<rule pattern='\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:9\1\2\3@$host$'
display='(\1) \2-\3'
transfer='sip:\1\2\3@$host$'
/>

change to (when dial 10 number auto add 1 )
<!-- 10-digits rules -->
<rule pattern='(\d{3})\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='(\1) \2-\3'
transfer='sip:\1\2\3@$host$'
/>
<rule pattern='\((\d{3})\)\s*(\d{3})\s*-?\s*(\d{4})(\s*[Xx]\s*\d+)?'
dial='sip:1\1\2\3@$host$'
display='(\1) \2-\3'
transfer='sip:\1\2\3@$host$'
/>