The default port range works fine (10,000-20,000), but when I try and use 30,000-40,000 nothing will work. I have no firewall in the mix. Is there an Asterisk limitation to what ports you can use? Has anyone successfully used ports higher than 30,000? If it matters I am using SRTP/TLS which means indirect RTP.
You need to edit the file rtp.conf
rtpstart=30000
rtpend=40000
I should have stated that. I did modify the start and end ports, that is how I attempted to use 30,000-40,000 but it will not work. If I switch it back to 10,000-20,000 it works just fine.
It does sound suspiciously like firewall type issues. Maybe you should take a pcap of a call (captured from both ends) and compare the two.