The following review was conducted in June 2011, and information on subsequent software updates and new version releases may not be reflected within. This review predates OnSIP’s mobile app for iOS and Android, free to OnSIP users, so is not affected by bias.
A more recent review of this phone can be found here: Blink Pro (v1.3.0).
AG Projects self-describes as a “company supplying service providers with turnkey SIP infrastructure systems.” The developer has implemented and supported ready-to-use SIP service related projects for cable operators and ISPs since 2002. The Blink Pro SIP client/softphone app is the user endpoint of their product portfolio.