Welche SIP-Anbieter bzw. SIP-Provider gibt es?
Which SIP providers are there?
SIP providers play a central role in VoIP telephony, as they act as a kind of central interface. They provide the service so that calls can be made over the Internet. SIP providers include sipcall, phonestar, sipstar, VoIP-One, Peoplefone, voip.free, netvoip etc.
