I connected the phone to the machine back to back. No switch or router or firewall in between. But no SIP information to the phone !!!!

Yes, I have:
Listen port: 5060
Transport: UDP (5060), TCP (5060)
interface: 192.168.1.2

1. Brekeke Product Name and Version: 3.9.4.3/517-1 2. Java version: 1.8.0_66 3. OS type and the version: Windows 10 4. UA (phone), gateway or other hardware/software involved: Grandstream1625X 5. Your problem: No registration possible with configuration according to guides: Server side: => IP / Port ...