Given the fact that one Gizmo5 Acct + One SipSorcery Acct. + Google Voice + some Ruby coding can get you free calling via Google Voice to US/Canada from any SIP device .... I can see Gizmo getting quite a few more users...
On that note Gizmo5>>SipSorcery>>VoXalot has been working just fine (but then I only use it once in a while)...
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