Noise in audio stream over VPN and RDP

Hello Dennis Kirschner,

Thank you for reaching out to the community, SFOS 18.5.2 MR-2-Build380 is already been declared End-of-Life on 30-Jun-2020. It would be great if you can upgrade the firmware to v18.5.4 MR-4 and then can you provide us a pcap file...?

Good suggestion. Also, it seems to me that there was another forum posting in the last year or two regarding HomeOffice problems.

because RDP is a secure protocol, which requires a cert exchange between the client and the RDP server the firewall will not see the SIP session and RTP stream transparently, so those system module settings will not be impacting any of this. The best way to handle this is to make sure the SSL VPN client is getting enough bandwidth. Also there is a good chance that the terminal server might be compressing the RTP stream when it is sending it across the IP to the thin clients and if this mechanism is not happening or if this mechanism is being impacted because of traversing across  a tunnel. When you say you turned off IPS completely did you stop the service ? or did you disable it on the rule only ?

Hello,

I will carry out the firmware upgrade in the short term.

But we were able to narrow down the problem a bit again:
We have set up a direct NAT to the terminal server instead of the VPN, so that we could connect to the server without VPN for testing. The problem occurs there as well. I had the impression that it did not occur so often, however.

We can therefore rule out VPN as the only cause.

We deactivated IPS via the switch under IPS protection.

Can you try this by stopping the IPS service on the UI completely ?

Hello,

unfortunately neither the firmware update nor disabling the ISP service solved the problem.

There seems to be an issue where you have an issue rendering the audio between your host client and the remote desktop server, there, can you try creating a dedicated QoS policy on the firewall for the RDP session ?