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VoIP Communications Providers

The following solutions typically cost pennies per minute for audio calls to/from/within US/Canada/UK and similar destinations. However, your mileage may vary (calls terminating at mobile phones in particular can be a lot dearer), so always read the fine print before you buy. Caveat Emptor, and all that. :-)

mobile phone
RebTel = how to use your local mobile minutes as international long distance
Truphone = VoIP on your mobile phone (UK)
VoIP
Gizmo5 = a free/cheap SIP (open standard)-based softphone
Skype = a free/cheap proprietary P2P-based softphone
Google Voice = Google's free super-duper softphone (US-only)
How to configure a Sipura SPA-2100 ATA
ENUM = the world standard
PSTN = peering numbers for VoIP to PSTN calling
CallCentric = a cheap pay-for SIP VoIP provider (tolls,DIDs,etc.)
IPKall = free WA state (US) DID (call-in number)
tollfree/fax
K7.net = free WA state (US) fax number (incoming only)
Kall8 = cheap US/CA toll-free phone number
Faxage = cheap US/CA toll-free fax number (incoming and outgoing)

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