Hi! A tried to test trial version of 3CX and I have some questions. 1. How can I change SIP domain to my own? 2. How can I activate TLS? I tried to use my own certificate from Comodo but I can't insert private key because it 4096 bits but textfield is only 2000 characters long. Also why it named API? 3. How can I activate SRTP for Cisco SPA303? 4. Does 3CX Tunnel technology use the encryption? What kind? 5. When I tried to test iOS client and I have a problem. It always drops the voice after a second. I tried different settings and modes with no luck.