Can't send REGISTER from inside Docker

[jfinstrom (James Finstrom)]

I message from one of the original FreePBX creators on docker with FreePBX

(Unofficial) Docker image of FreePBX 15 + Asterisk 16 - izPBX project

I really wish people would stop doing this 8-( You have a whole bunch of problems waiting for you. Firstly, you have a new and exciting level of NAT problems by putting it inside docker. Secondly, because Docker has to proxy ports individually, you’ve limited the RTP range to be 10000-10200, which means at most 50 simultaneous calls and as a wonderful bonus to that, you’ve removed all the security that randomizing RTP gives you (which you really want because spoofing RTP is trivial) Thirdly …