Hello everyone, I'm using the latest version of openwrt, when I open the call with wi-fi on my phone, we have a bufferbloat problem, sqm on, do you have any advice on this subject?
End the call, fix the vague thread topic ?
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Okay, I corrected the title. I need to enable calling via Wi-Fi at home.
You did?
Still vague, no details about the OpenWrt device, no configs, no clue why you're asking OpenWrt about your cell service, what carrier, cell device, country, E911 address configured (I know this is required in the US for some carriers), etc.
Are you willing to provide details needed to assist you?
- ISP details?
- Are you saying that a bufferbloat problem only occurs when you start a call?
(Clarity please.)
Hostname OpenWrtModel Xiaomi Mi Router 4A Gigabit EditionArchitecture MediaTek MT7621 ver:1 eco:3Target Platform ramips/mt7621Firmware Version OpenWrt 25.12.0-rc2 r32429-d76c64ad00 / LuCI openwrt-25.12 branch 26.006.11347~6e7ed76Kernel Version 6.12.63Local Time 8 Oca 2026 20:20:19 GMT+3Uptime 3h 54m 21sLoad Average 0.03, 0.17, 0.22
Türk Telekom Fiber İSP
But the lines on the phones are Vodafone
My problem is that when we make calls over Wi-Fi on our phones, the Wi-Fi connection gets congested and our speed drops.
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- Did this work previously, if so what version of OpenWrt?
- Do you have details regarding your WiFi calling, credentials, etc?
- Have you spoken to your cell carrier?
(Clarity and details, please.)
- What device?
- I assume Turkey?
So if you’re sure Wi-Fi calling issues are related to bufferbloat did you follow the SQM guide to attempt to fix it? Because if I enable and configure SQM using that and test my bufferbloat it’s A+/A+ and there is never any bufferbloat issue.
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We have two iPhone 7s and one iPhone 12. I haven't spoken to the operator.
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OK, as the other user noted - have you reviewed the documentation?
Yes, everything is exactly as described in the guide, nothing is missing.
(That seems to be your issue.)
Have you disabled it and tested?
Ok if you followed the guide and have obtained bufferbloat and quality ratings of A or A+ I can pretty much assure you it is not a bufferbloat related issue and is somewhere else in the connection. Could be Wi-Fi driver related, maybe try enabling software flow offloading if it’s not, adjust AQL limits down if you’re router supports it, could be your service provider, the mt7621 is fairly slow it could be CPU limited, etc.
I solved the problem by doing what you suggested, but I can't run SQM anymore. It was causing issues when I activated Wi-Fi calling while software flow offloading was enabled, so I decided to completely uninstall SQM. We'll figure it out later when I get a more powerful router. Thanks.
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That doesn’t surprise me on that CPU. The combination of enabling flow offloading and packet steering should be enough for you. Glad it works for now.
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I was actually considering the AX3000T, but I ended up buying this device. My download speed is 200 Mbps, but when I activate the software stream, there are a lot of inconsistencies in the SQM upload speed.
Yes that is common especially with a weaker CPU, just leave SQM off.
That being a mediatek SoC (mt7621) it might actually support hardware flow offloading which can be even faster. I’m not sure though, you would have to enable it, then SSH in and install and run ‘htop’, watch the CPU cores while doing a large download and see if the CPU usage stays very low, if it does then it’s hardware offloading. If you don’t want to mess with all that though then just leave software flow offloading selected, it’s probably good enough.
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Honestly, I've tried everything you suggested. The forum is full of my threads, and because I only have a 200mbps download speed, I've never been able to use my SQM at full performance. If one thing improves, another thing breaks down. So, the most sensible thing to do would be to buy a more powerful router.
Get a GL-MT6000 once you can budget it, goes on sale frequently, been using it 2 years and it’s a little beast. Great performance and great wifi 6 driver too.
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Okay, I'll try.
I had to enable software flow acceleration and use all CPUs for SQM. Do you have any additional advice?
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