Have done some more testing - the issue appears to be that packets are dropped or a timing resync happens when connecting to PortAudio through the dialplan.

Tests:

Soft phone (MicroSIP) > Conference > Verto (on Chrome) - sounds great.

Verto (on Chrome) > Conference > Verto (on Chrome) - sounds good, some crunchiness, some drops.

Soft phone (MicroSIP) > PortAudio > external system > PortAudio > Verto (on Chrome) sounds pretty good.

Verto (on Chrome) > PortAudio > external system > PortAudio > Verto (on Chrome) sounds quite poor, lost words.

External system is 48KHz and PortAudio > external system > PortAudio sounds perfect.

Recordings of the above are at https://bit.ly/3EFFyb0

Jitter buffers aren't making any difference and the timer_test shows good numbers. All are using the Opus CODEC.

Any other ideas, please ?

---

From: Support from NetworkedAudio LLC
Sent: Wednesday, June 10, 2020 2:35 PM
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Subject: Timing issues with Verto, SIP client works fine

 

Hi all,

We're using VERTO in an intranet application.

If we do anything other than an echo test, we get dropouts on bridge (to SIP phone or PortAudio), which either drops whole sounds (count 1,2,4,5,7,8) or slurs ("se-even"). 

This happens with MS Edge (worse) and Chrome (better), with PCMU and OPUS.

Turning off audio processing (googEcho...) has no effect. Changing RTP_TIMER from SOFT to NONE seems to make the dropout more random. It's not a network bandwidth issue - this can happen across a gigabit link.

Using exactly the same computers and headsets but using MicroSIP, everything is perfect.

Have tried jitterbuffers, but they don't help (as it's not a delay issue) - it really feels like a timing problem going from Verto into the rest of the system.

Where should I look now? Have tried 1.10 but no change.

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