I tested the Janus Gateway on your demo site and using the SIP Gateway Demo I can successfully register to my Asterisk PBX and call SIP Peers.
But when I installed the Janus Gateway on my CentOS 7 server I can register to my Asterisk PBX but I can not call any SIP Peers.
So Since it works on your demo page I'm assuming I may have some settings wrong on the Janus Gateway.
In the console logs it shows:
Notifying application...
siptest.js:132 ::: Got a message :::
siptest.js:133 {"sip":"event","result":{"event":"calling"}}
siptest.js:161 Waiting for the peer to answer...
At this point it just sits there and times out (408)
We discussed this issue here: https://github.com/meetecho/janus-gateway/issues/259 but never figured it out.
Here's some debug logs from janus, sofia sip, and asterisk:
Could you please give me a starting point on how to troubleshoot this?
Thanks