PC-to-PC VoIP via Microsoft MSN and/or Skype
It is not a great and easy VoIP experience but it is free anyway. You just need a high speed Internet Broadband that has speed more than voice codec (64 Kbps) together with a good headphone (of course you can use a mic with a speaker phone if you don't care about acoustic echo). The most annoying to me about PC-to-PC VoIP is appointment. You need to tell your partner in advance to be online at the time you "VoIP" him/her.
It is not a great and easy VoIP experience but it is free anyway. You just need a high speed Internet Broadband that has speed more than voice codec (64 Kbps) together with a good headphone (of course you can use a mic with a speaker phone if you don't care about acoustic echo). The most annoying to me about PC-to-PC VoIP is appointment. You need to tell your partner in advance to be online at the time you "VoIP" him/her.
Somebody is wondering about quality of MSN and Skype VoIP. There is a paper comparing MSN and Skype VoIP at http://www.multicomm.org/proc_multicomm06_3.pdf.
PC-to-Phone VoIP
PC-to-Phone VoIP
This could be either free or charge service depends on where on earth you are. Both MSN and Skype provide PC-to-Phone but you need to pay.
Phone-to-Phone VoIP
Absolutely this is not a free service unless you own VoIP network between destinations ;-)
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