Let me guess. You’re here because you’ve had an issue with Voice over IP (VoIP) or video conference calls. Or maybe you’ve had some general issues with your Internet speed. You’re not alone!
This post will help you configure your existing router to get the best possible experience in real-time online communication, or Netflix streaming, or any other things you do online, for that matter.
It’s all about QoS.
Dong’s note: I first published this post on March 23, 2020, and updated it on December 16, 2021, with additional relevant information.
QoS explained: What is it?
QoS stands for Quality of Service — a routing feature that allows users to prioritize the bandwidth — most applicable to the Internet bandwidth — for specific programs, clients, or services.
In a nutshell, the way it works, QoS takes the existing broadband connection and designates a specific amount of requested bandwidth to your desired target, in real-time, before the rest of the network.
For example, if you prioritize VoIP, your Internet-based calls will get all the bandwidth it needs before any other applications. Or, if you prioritize your Xbox (or a particular game), then the game console will get the first dibs on the Internet before any other devices.
And you can do that with anything you want, like Netflix streaming or online surfing. You can even do that with file downloading, too — though, well, you shouldn’t.
Downloading never requires prioritizing. Instead, it’s the reason why you need QoS in the first place. When left alone, a single file download job will hog all the bandwidth, no matter how fast the Internet connection is, until it’s complete.
So, QoS is sometimes also about giving specific devices or services the lowest priority of the broadband to make sure they will not interfere with the regular operation of the rest of the network.
When properly configured — not an easy task — QoS can make everyone happy, even when you have a modest Internet connection.
What QoS vs Intenet speed
It’s important to note that QoS is not about making your Internet speed fast(er) — you wish! It’s about giving you exactly what you (your device at hand) need when you need it and possibly not more.
Consequently, when you turn on QoS, you tend to have slower speed test results — and that’s the point because speed testing is not how we generally use the Internet. Keep that in mind.
Also, when you misconfigure QoS and set its download speed significantly lower than your broadband’s actual speed, then the set QoS speed will be the ceiling.
That said, if you have turned QoS on in your router and now upgrade your Intenet to a faster speed grade, make sure you adjust your QoS settings. Else, you’ll continue to get the former speed.
It’s about understanding how it works and paying attention.
What you need to use QoS
You generally need two things to take advantage of QoS.
First and foremost is a router that supports this feature. Most, if not all, home Wi-Fi routers have QoS, but the way they do it varies from one vendor to another. There are a lot of degrees and nuances when it comes to this feature.
In my experience, Asus routers support this feature well and allow for easy configuration. Those from Linksys, Netgear, and TP-Link are also quite good.
Secondly, you need to know your Internet connection’s actual speed and quality. It’s pretty easy to find out — I wrote a long piece on speed testing if you need to know the exact numbers and what they mean.
But generally, you can do a quick speed test right now to find out your ballpark figures.
Done? I hope you got good numbers.
It’s best to know your exact broadband speeds when setting up QoS, which can be a tricky thing.
That said, keep in mind that it’s OK to use a slightly lower speed for your QoS. So if you have 500Mbps for download, you can enter 450Mbps.
However, it’s never good to use a higher number. (Like 550Mbps). In this case, QoS might produce no meaningful result at all. It can even make things worse.
The rule is this: Set your QoS to use as close to the exact broadband bandwidth as possible, but never above that.
With that, let’s set the right expectations on what you can get out of your QoS-enabled Internet.
Setting the right expectations with QoS
For QoS to be effective, your Internet has to be at least fast enough, or better yet, faster than what’s needed by the prioritized party. So, say, if your application needs 25Mbps of download speed and your broadband caps at 20Mbps, well, no QoS can help you in this case.
I picked 25Mbps for a reason. That’s the download speed required for streaming 4K content on one device, from Netflix or any other service.
So if you’re suffering from buffering and wait time while streaming over a modest Internet connection, don’t immediately blame your Wi-Fi for it — they are two different things.
Also, QoS can not improve the quality of your Internet connection. For example, if your broadband has high latency (lag), which is terrible for real-time communication, QoS won’t improve that. All it can do is give a particular application, service, or client within your network the best possible experience within what you have.
Lastly, QoS is generally not necessary when you have a high-speed broadband connection that has enough bandwidth for all of your applications at once.
But even then, if you know that somebody in your home regularly downloads stuff, like using a BitTorrent client, then it’s still a good idea to turn this feature on.
That is a typical case where low-priority QoS applies, as mentioned above.
Broadband requirements for VoiP and video conferencing
Generally, a broadband connection of 50Mbps download / 15Mbps upload or faster is enough for almost any online application. That’s one instance of the app.
If you have multiple applications, keep in mind that each requires similar bandwidth of its own. For example, most video conferencing apps require at least 2Mbps per screen.
In reality, it likely uses more if you do that in Full HD or 4K. So, to be sure, give each screen an allotment of 25Mbps for download.
The upload pipe varies. But if you want folk on the other end to see you in HD, you’ll need 25Mbps for upload, too. Unfortunately, most cable broadband can’t deliver that since they cap at around 15Mbps. So likely, you can only broadcast yourself at lower resolutions.
Internet-based voice/video communication’s requirement on latency is relatively lenient. Specifically, your connection should have less than 150ms (millisecond) and 30 ms in Ping and Jitter values, respectively, for VoIP to work well. (Ideally, you want those numbers to be 15ms and 10ms, respectively.)
A typical residential broadband connection generally has those at less than 20ms. But the lower the values, the better the call quality you’ll get. That is, of course, assuming that you don’t turn on the (out-going) video quality to require more than that of the upload pipe.
It’s important to note that you should remain relatively at one spot (or one room) while doing a voice or video call — better yet, start your Wi-Fi connection at that location. If you have the habit of moving around your (large) house, no router or system can make that work well. So no QoS can help, either.
(By the way, the quality of a real-time communication application depends on both ends. The point is don’t immediately blame your Internet for a sub-par experience — it might be the fault of the remote party.)
How to configure your router’s QoS
The way you work with QoS varies depending on the routers. Generally, routers from the same vendor share the same interface or mobile app, and therefore the same way for users to customize their settings.
The web interface is always the best way to manage a router since it gives you in-depth access to all features and settings. And QoS is one of those advanced features. But some vendors, like Linksys, also allow configuring this feature via the mobile app.
But I always prefer the web interface, and here are the general steps on how to configure your QoS:
1. Log into your router’s interface
To do this, navigate your browser (Chrome, Firefox, or Edge) to the router’s default IP address (or friendly URL).
If you don’t know yours, check the table below or this post on IP addresses. And log in with your router’s admin account.
|Vendor||Friendly URL||Default IP||Username||Password|
|AT&T Gateway||n/a||192.168.1.254||n/a||Access code printed |
on the hardware unit
Access code printed
on the hardware unit
|Most Cable Modems||N/A||192.168.100.1||n/a||admin|
2. Customize the router’s QoS feature (for VoIP)
This feature is almost always in the Advanced area of the interface. It generally has “QoS” or “Prioritization” in its name.
Traditionally, you’ll need to enter your broadband connection’s download and upload speeds. In this case, enter the exact numbers or slightly lower ones.
Again, definitely don’t enter higher numbers than your actual download and upload speeds. Some routers can figure out these numbers by themselves.
Now, make sure you prioritize the QoS according to your needs. For this article, pick VoIP and video calls as your top priorities.
If there’s no option to prioritize a service or application, you can choose to prioritize the particular client on which you’ll use the service. So if you use your iPad for conference calls, make your iPad the one with the highest priority.
Note that if you choose to prioritize a particular device, it’s a good idea to have that device’s IP address reserved within the router so that it will not change.
Extra: Disable SIP ALG (or SIP Passthrough)
This setting applies when you need your router to work well for Voice over IP, and even then, only to specific situations. So it’s something to try when you have Wi-Fi calling issues, like delays.
SIP ALG stands for Application Layer Gateway, a setting available in most home routers and is turned on by default. Initially, this setting intends to help better VoIP packages travel through the router’s firewall. In reality, it rarely works out as expected and often causes issues.
So, you might need to turn SIP ALG (also known as SIP Passthrough or SIP) off (or disabled ) to have a better VoIP experience. The location of the SIP setting varies, but generally, you can find it in the WAN (Internet) or Firewall area of a router’s interface.
3. Apply the changes
Once you’ve changed the setting, make sure you apply it. In some instances, the router might restart. Even if yours doesn’t, it’s a good idea to manually repower it, then check again to ensure the new settings are correctly set. Now, your QoS is in effect.
Extra: Steps to optimize Asus’s QoS for voice and video communications
If you happen to have an Asus router, the following are specific steps to customize its QoS for voice and video conferencing. While they are not the same as how you’ll find in a router from another vendor, they will give you some ideas.
Update: In late March 2020, Asus released a firmware update — for most, if not all, of its routers — that adds additional categories to the Adaptive QoS feature. One of these is Video Conferencing (or Work-From-Home), which prioritizes the Internet for real-time video communication apps, including Microsoft Teams, ZOOM, Skype, Google Hangouts, and BlueJeans.
1. Log in to your router’s web interface.
From a connected computer, point your browser to router.asus.com, you’ll reach the interface. Enter your username and password and click on Sign In.
2. Update to the router to the latest firmware
- Click on Administration menu item
- Click on Firmware Upgrade tab
- Click on the Check button for new Firmware Verison. Alternatively, you can also download the firmware directly from Asus. In this case, use the Upload button to upload the firmware to the router manually.
- Follow the rest of the process to upgrade the router to the latest firmware. Note: Don’t turn the router off during the process which will take no longer than 5 minutes. Afterward, it’s a good idea to manually restart the router.
3. Turn on the AdaptiveQoS features
- Click on the Adaptive QoS menu item and then on the QoS tab.
- Slide the Enable QoS to On
- Click on the Video Conferencing button. Note: In certain router models, real-time communication as part of the Work-From-Home category.
- Optional: Click on Customize and drag the blocks of other categories according to your needs –you can hover the mouse on each block to see what type of applications/services that category includes. Then click on Save.
- Click on Apply.
The router will take a few seconds to apply the changes.
4. Disable SIP Passthrough (when need be)
- Click on the WAN menu (under Advanced Settings), and then on the NAT Passthrough tab
- Change the value of SIP Passthrough to Disable
- Click on Apply, and wait for the router to apply changes.
Manually restart the router and check to make sure all is good. And that’s it! Your Asus router should work better for your online communication application now.
Internet traffic is somewhat like cash flow for a household (or a business) — it’s all about managing its right and staying on the budget. And that’s where QoS comes into play.
Again, this feature is about giving a device the bandwidth it needs (and no more) when it needs it. It does not make your Internet faster.
QoS is about degrees and nuances. When you configure it correctly, you’ll be surprised how little Internet bandwidth you actually need.
And vice versa, in a poorly configured network, even Gigabit broadband is not consistently fast enough for every device within the network.