[amiraliakbari]

Although Signal is not closed-source, they tend to discontinue useful features of their product. For example RedPhone server code has been removed from GitHub after it was discontinued.

Last time I checked, it is not really feasible to setup a standalone Signal instance. Is there any guide to deploying a standalone version of Signal on your own servers or a successful example of it? If not, their approach may be more of "see but not touch" than being a free software. Also decisions like dependency on GCM and discontinuing features to increase development speed make Signal less reliable as a open source project.

[mfwoods]

I assume they removed it because they don't want anyone to use old insecure code. The RedPhone server hasn't been used for years now and was replaced with a better implementation.

You're right there's no official support on their server, but there are some unofficial guides on their community forums on how to set it up. Also, GCM is not a hard dependency. On Android it will fall back to using only websockets (and no GCM) when Google Play Services is not installed since some time. What other features have they removed without replacement?