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PSIP (aka PuppyPhone) is a simple GUI for SIP phone for Linux].

GTK version used for building: 2.18 (also works with 2.16).

pjsip version used for building: 1.10.

Other tools required: (included in tarball), and

License: GPL Version 3 or later].

information about PSIP]

Compiles into a single executable in "release" mode. is how to build it].

Binaries available