Calls not connecting with Wireguard VPN

[tomleb]

Describe the bug

I have a VPN server at home to connect to my homelab. I connect to it using wireguard on android. The VPN configuration only allow the subnet 192.168.255.0/24 to the tunnel.

When my vpn is up on the phone, calls no longer connect. I see "Call connecting..." forever. With the VPN down, everything works fine.

To Reproduce Steps to reproduce the behavior:

1. Start the vpn on the phone
2. Make a call to someone (1-to-1 call)
3. Call stuck in "Call connecting..." state

Expected behavior

I would expect the call to connect since only traffic within 192.168.255.0/24 goes through the VPN.

Smartphone (please complete the following information):

• Device: Xiaomi, Mi A2
• OS: Android 8.1.0

Additional context

• App version and store: 1.0.14 - F-Droid
• Homeserver: matrix.org

I see a similar behavior in Jitsi, calls connect but I don't get any audio/video from the other person, and the person doesn't get any audio/video from me.

Here's the configuration file for wireguard for the phone:

[Interface]
Address = 192.168.255.2/24
PrivateKey = <private key>

[Peer]
AllowedIPs = 192.168.255.0/24
Endpoint = 192.168.0.175:51820
PublicKey = +883cYmWGvYEkjZW7JBinmxx/zqhx+LnwFI3MOWPjlY=

[pklampros]

I have the same problem (android 11/LineageOS 18.1), however, this only seems to happen with wireguard as a kernel module, not with the userspace backend

[hardwareadictos]

Anyone managed to fix this? Having the same issue here

[An4cl3t0]

I can confirm the issue, at first I thought it was my TURN server but tried with a public one and I had the same problem.

Then I disconnected Wireguard and works. To me does not work in either user mode or kernel mode.

I have a POCO F3 with Lineage 20.

Have you guys tried with another application for android?

Thanks