[Freeswitch-users] Oneway Audio, can’t send RTP back to UAC

[Dragos Oancea]

PCMU:0 is normal. 0 is the payload type for PCMU.
Perhaps you have the firewall enabled on the machines themselves ?  Flush
your iptables rules, just to see if it works.



On Thu, Jul 9, 2020 at 8:17 PM Muhammad Naseer Bhatti <nbhatti at gmail.com>
wrote:

>
> Hi,
> I can’t seem to be able to figure out why I can’t send RTP to the other
> side (UAC) of the switch (One way audio?) . I have FreeSWITCH Version
> 1.10.4-dev git 00113c4 with vanilla config (for testing) on Public IP
> address and the other switch is also on Public IP on same subnet. I receive
> call from SippySoft (UAC) and playing delay_echo application. The call flow
> is
>
> SIP UA (NATted) -> SippySwitch (Public IP) - FreSWITCH (Public IP)
>
> FreeSWITCH after answering the call says
>
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:5594 Audio Codec
> Compare [PCMU:0:8000:40:64000:1]/[PCMA:8:8000:20:64000:1]
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:5594 Audio Codec
> Compare [PCMU:0:8000:40:64000:1]/[PCMA:8:8000:20:64000:1]
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:5594 Audio Codec
> Compare [PCMU:0:8000:40:64000:1]/[PCMU:0:8000:20:64000:1]
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:5630 Audio Codec
> Compare [PCMU:0:8000:20:64000:1] is saved as a near-match
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:5701 Substituting
> codec PCMU at 40i@8000h at 1c
> 2020-07-09 21:48:37.902333 [DEBUG] switch_core_media.c:3839 Set Codec
> sofia/internal/04232152273 at 43.225.99.130 PCMU/8000 40 ms 320 samples
> 64000 bits 1 channels
> *2020-07-09 21:48:37.902333 [DEBUG] switch_core_codec.c:111
> sofia/internal/04232152273 at 43.225.99.130 <04232152273 at 43.225.99.130>
> Original read codec set to PCMU:0*
>
> and then starts delay_echo() app. Isn’t  Original read codec set to PCMU:0
> is a bad thing? Perhaps the reason not able to send RTP back?
>
> On the other hand, I installed Asterisk 13.34.0, on the same machine, just
> to prove the point if there is network issue but things work just fine with
> Asterisk default config. Seem like there is either something not configured
> (default) in FreeSWITCH and I can’t seem to be able to find either. SDP in
> Asterisk and FreeSWITCH both seems to be the same.
>
> FreeSWITCH SIP Trace is here https://pastebin.freeswitch.org/view/0925119c
> and console log is here https://pastebin.freeswitch.org/view/69b5f68c
> Asterisk SIP Trace is here https://pastebin.freeswitch.org/view/f38abc97
>
> Appreciate some input to figure out this problem.
>
>
> Thanks,
> Naseer
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