VoIP service

I recently signed up for the voice-over-IP service of Call Centric. I was looking for a VoIP provider that would not cost much, did not require any long-term commitments, provides a good audio quality, and works using the SIP-protocol. The provider that I am looking for needed to support incoming calls to a US-number and outgoing voice calls to VoIP as well as non-VoIP numbers, using caller ID of the incoming US-number. In addition, I wanted voicemail, and the possibility to save voicemail to local files. Call Centric offers all of this, and more.

In combination with the X-Lite soft phone, I have found what I am looking for.