I have a setup which is not working right now:
Provider – DSL-Router (192.168.2.1) – Bintec-Router (10.17.46.66) – Asterisk (10.17.46.99)
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My issue: Everything works, but RTP is only going from my Asterisk towards the provider. Asterisk is configured to use SIP-ports 55060 and RTP-ports 51000-51999. Those ports are forwarded on DSL-router to the bintec router and from the bintec router to asterisk.
What I see is the Invite from provider goes to 192.168.2.1 and rtp port 7070. my asterisk responds with audio to be sent to ip address 220.127.116.11 port 51242. Afterwards RTP goes from 10.17.46.99:51242 to 192.168.2.1:7070. but the RTP back is not coming in.
I would expect the RTP traffic to be sent to 18.104.22.168 (internal 192.168.2.1) port 51242 – then i would have successfully two way audio. But why is port 7070 used?
The DSL-router is a speedport w724v type A.