通过因特网电话服务提供者(Internet telephony service providers，ITSP)，用户可以在PC机与普通电话(或可视电话)之间或者普通电话(或可视电话)之间通过IP网络进行通话。
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Internet telephony service providers can also be encrypted through a secure connection for software upgrades and remote Settings.
互联网电话服务供货商还可通过安全加密的连接对软件和设定进行远程升级。
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But Internet service providers who want to bundle telephony to their customers using the public Internet will have to invest heavily in bandwidth if quality is to be acceptable.
ECONOMIST: Internet telephony
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