[Freeswitch-users] codec negotiation error

[Brian May]

Brian West <brian at freeswitch.com> writes:

> Focus on the NAT issue between the phone and FreeSWITCH.

All of that seems to be working...

Here is a partial tcpdump with packets to/from the server:

09:49:29.224492 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.243749 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.263882 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.283501 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.303796 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.321400 IP 59.167.180.194.19289 > 103.140.134.33.21005: UDP, length 112
09:49:29.323725 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.343927 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.363231 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.383833 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.403074 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.423905 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.443366 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.463924 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.483771 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.503919 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.523919 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.543937 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.548972 IP 103.140.134.33.21005 > 59.167.180.194.19289: UDP, length 84
09:49:29.563806 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.583645 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.604072 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.623863 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.643842 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.663620 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172
09:49:29.683939 IP 59.167.180.194.19288 > 103.140.134.33.21004: UDP, length 172

As you can see outgoing audio is getting sent. And it is confirmed to be
received, I can hear it.

But I simply am not getting the audio packets in.

Periodically I do get an RTCP packet in however. As in the 84 byte
packet above. This gets all the way through to my freeswitch server.

This RTCP is a sender report, and seems to indicate that the sender is
sending me packets, that the sender is using my correct IP address, and
no firewall is blocking any packet.

So how is it possible I am receiving RTCP sender reports, but I am not
receiving the data packets?
-- 
Brian May <brian at linuxpenguins.xyz>
https://linuxpenguins.xyz/brian/