Example of PC based VoIP are skype VoIP, Yahoo Messenger VoIP,
MSN VoIP, and lot more of web browser online chat application.
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Yes you can use it but still you need to subscribe voip service
from VoIP service provider.
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A VOIP router can be purchased at any good computer hardware or
electronics store. There are also numerous online stockists of VOIP
routers, VOIP phones and VOIP modems with inbuilt routers.
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A VoIP converter that convert voice signal into digital signal
with more ports than VoIP modem. This router can handle different
VoIP channels.