Hello
As you can see from docs
https://docs.flashphoner.com/pages/viewpage.action?pageId=9241885
Default SIP client ports are [30000 - 31000] TCP UDP
port_from=30000
port_to=31000
Default RTP, ICE, DTLS, RTCP, ports are [31000 - 32000] TCP UDP
media_port_from=31000
media_port_to=32000...