You can use your brand with ProPTT2.

ProPTT2 support changing brand in client and server-side.

Smartphone Client

First, you can make your client through usign client SDK.
If you don't want to develope it, you can purchase a client customizing program license to customize.

1. ProPTT2 client customizing. (Common guide)
2. ProPTT2 Android customizing. (Android guide)
3. ProPTT2 client white label program.

PC Client

First, you can make your client through usign client SDK.
If you don't want to develope it, you can customize it by yourself.

1. ProPTT2 PC client customizing.

Server

If you have ProPTT2 server, it would be easy. The server already support customizing about name and logo.

Limitation

In customizing program, you have to appear "Powered by ProPTT2".