--- title: "Common VoIP Problems and How to Fix Them | Chargezen" description: "Choppy audio, delay, echo, one-way audio, dropped calls and phones that never ring: what causes each VoIP problem and the fixes to try, in order." url: "https://chargezen.com/blog/voip-problems" lang: "en" updated: "2026-10-18" --- Canonical URL: https://chargezen.com/blog/voip-problems # Common VoIP Problems and How to Fix Them DTC Strategy · 10 min read ![Jerry Abrahamson](https://chargezen.com/assets/blogpost1.6581a30d.png) Jerry Abrahamson Founder & CEO • Oct 18, 2026 ![Common VoIP Problems and How to Fix Them](https://chargezen.com/og-default.png) Internet phone calls are cheap, flexible and, most of the time, as clear as a landline. When they go wrong, they go wrong in a handful of recognizable ways: voices break up, there's a half-second lag, you hear yourself echo, one person can't hear the other, calls drop at the same minute every time, or the phone simply never rings. Each of those symptoms points to a short list of causes, and most can be fixed without buying anything. This guide maps each symptom to its likely cause, shows how to confirm it, and gives the fixes in the order worth trying. Where we give a number to aim for, we name the standard or vendor it comes from. ## Start here: match the symptom to the cause | What you hear | Most likely cause | First thing to try | | --- | --- | --- | | Choppy, robotic or missing words | Packet loss or jitter on your network or Wi-Fi | Plug in with a cable and pause big uploads | | A delay; you keep talking over each other | High latency (a long route, a VPN, a busy connection) | Turn off the VPN and test latency | | You hear your own voice a moment later | Echo at the other end of the call | Ask them to take the call off speaker | | One side can't hear the other | Router or firewall rewriting call traffic (SIP ALG, NAT) | Turn off SIP ALG on the router | | Calls drop at the same point every time | A router or firewall timing out the call | Turn off SIP ALG, then check firewall timeouts | | Your phone or app never rings | The phone lost its registration, or a setting sends calls elsewhere | Restart the app or phone, then check Do Not Disturb | | Bad only at certain times of day | Your connection is full (backups, video, uploads) | Find what is uploading and schedule it for later | | Bad only on one headset or phone | The device, its cable or Bluetooth | Try a wired headset or another device | A quick guide. The sections below explain how to confirm each cause. ## Choppy or robotic audio A VoIP call sends your voice as a steady stream of small packets, usually one every 20 milliseconds. When some packets never arrive (packet loss) or arrive in uneven bursts (jitter), the app has gaps to fill. It stretches or guesses the missing sound, which is where the robot voice and clipped words come from. Packet loss and jitter almost always come from the network between your device and the internet: crowded Wi-Fi, a busy upload, an old router, or trouble on your internet provider's line. Speed tests that show only download speed won't find them. Use a test that reports jitter and packet loss, such as the free [Cloudflare Speed Test](https://speed.cloudflare.com/) (checked October 19, 2026). Our [guide to jitter, latency and call quality](https://chargezen.com/blog/voip-jitter) explains how to test properly and what numbers to aim for. * Test on a cable first. If audio is clean on a cable and choppy on Wi-Fi, the problem is the Wi-Fi. * Pause cloud backups, large uploads and video streams, then call again. If quality improves, your connection is full. * Restart the router and modem. Old firmware and long uptimes cause more trouble than people expect. * If the problem continues on a cable with nothing else running, run the test several times and send the results to your internet provider. ## Delay and talking over each other Delay (latency) is how long your voice takes to reach the other person. A little is normal. The international standard for voice delay, [ITU-T Recommendation G.114, One-way transmission time](https://www.itu.int/rec/T-REC-G.114/en) (checked October 19, 2026), says that if one-way, mouth-to-ear delay stays below 150 ms, most applications feel essentially instant. It also says one-way delay should not exceed 400 ms in general network planning. Somewhere above 150 ms, people start to talk over each other and pause awkwardly. Common causes are a VPN that sends your calls through a distant server, a connection busy with other traffic (the router's queue fills up and every packet waits), and satellite internet. Microsoft recommends sending call traffic around the VPN rather than through it, because VPNs add encryption, distance and jitter ([Microsoft's guide to preparing a network for Teams](https://learn.microsoft.com/en-us/microsoftteams/prepare-network), checked October 19, 2026). ## Echo If you hear your own voice a moment after you speak, the echo is usually created at the other end: their speakerphone plays your voice and their microphone picks it up again. If they hear themselves, the problem is on your side. Delay makes echo much easier to notice, so fixing latency often makes echo fade too. Our guide on [how to stop echo on phone calls](https://chargezen.com/blog/how-to-stop-echo-on-phone-calls) covers every cause and fix. ## One-way audio or no audio The call connects, but one person hears nothing. This is almost always the router or firewall. Call setup and the voice stream travel separately, and a router that rewrites addresses can send the voice to the wrong place. The usual culprit is a router feature called SIP ALG (Application Layer Gateway), which is meant to help VoIP but often breaks it. [SonicWall's SIP ALG article](https://www.sonicwall.com/support/knowledge-base/how-to-disable-sip-alg/210615065648977/) lists one-way audio, phones that don't ring, no incoming calls, calls that drop after connecting and calls going straight to voicemail as signs that SIP ALG should be turned off, and says to turn it on only if your router maker or VoIP provider tells you to. [ServiceTitan's SIP ALG article](https://help.servicetitan.com/docs/disable-sip-alg-to-improve-servicetitan-call-quality) gives the same advice for cloud phone systems. Both checked October 19, 2026. * **Find the setting**: Log in to your router (often 192.168.0.1 or 192.168.1.1, or the router maker's app) and look under WAN, NAT, Firewall or Advanced settings for "SIP ALG" or "SIP passthrough". * **Turn it off and restart**: Save, restart the router, then restart your phones or VoIP app so they register again. * **Test both directions**: Make an outgoing call and an incoming call, put one on hold and transfer one, and check that both people hear each other the whole time. * **If your internet provider manages the router**: Some providers lock the setting. Ask them to turn it off, or ask your VoIP provider which settings they recommend. ## Calls that drop at the same point If calls end after almost exactly the same time, say 30 seconds or 15 minutes, the network is closing the connection, not the signal fading. ServiceTitan lists calls that drop at a consistent time as a SIP ALG symptom. The other cause is a firewall that forgets idle connections too quickly. Turn off SIP ALG first. If drops continue, ask your VoIP provider which firewall timeout they need, and give them the exact times calls ended. Random drops are different: they point to Wi-Fi, a weak cell signal or an overloaded connection. See [why your phone keeps dropping calls](https://chargezen.com/blog/why-does-my-phone-keep-dropping-calls) for phones and Wi-Fi calling. ## Your phone or app never rings * **Registration**: A VoIP phone or app has to keep checking in with the provider. If it lost that connection, calls fail or go to voicemail. Restart the app or phone and check that it shows as online. * **Do Not Disturb and forwarding**: Check the app's availability status, the phone's Focus or Do Not Disturb, and any forwarding rules in your provider's settings. * **Battery and background limits**: On phones, battery savers can stop a VoIP app from waking up. Allow the app to run in the background and turn on its notifications. * **SIP ALG again**: SonicWall lists "phones do not ring" and "no incoming calls" among its symptoms. ## Bad Wi-Fi, VPNs and busy connections Wi-Fi is the most common cause of poor VoIP in small offices and homes. Microsoft's Teams guide notes that the 2.4 GHz band is often crowded by other devices, that 5 GHz suits calls better but needs more access points, and that neighboring access points should use channels that don't overlap. It also recommends Wi-Fi Multimedia (WMM) so voice is sent first. * Use 5 GHz (or 6 GHz) for the devices you call from, and sit within sight of the access point. * Use a cable for desk phones and the computer you take calls on. * Turn on WMM or QoS on the router if it has the option, and give voice the highest priority. * If your router has smart queue management (SQM), turn it on. It stops big uploads from filling the queue that calls wait in. * Keep calls out of the VPN, or ask whoever runs it to set up split tunneling. ## Headsets, handsets and Bluetooth When only one person in the office has bad calls, start with their equipment. Try a wired headset, then another computer or phone on the same network. Bluetooth headsets often switch to a lower-quality mode when the microphone is on, and they can fall out of range. Make sure the app is using the device you think it's using: computers often pick a webcam microphone or monitor speakers on their own. ## When it isn't you Sometimes the trouble is at the other end, at your provider or between carriers. Clues: the problem happens only with one caller, only to one area, or for everyone in your office at once on a clean connection. Call a few different numbers, including a cell phone on another carrier, and check your provider's status page. ## Fixes in order Work down this list and stop when the problem goes away. The early steps are free and quick; the later ones take more time. * 1\. Restart the phone or app, then the router and modem. * 2\. Call from a cable instead of Wi-Fi, with nothing else uploading. * 3\. Run a test that reports latency, jitter and packet loss, on Wi-Fi and on a cable, at the time the problem happens. * 4\. Turn off the VPN for calls. * 5\. Turn off SIP ALG and restart everything. * 6\. Move calling devices to 5 GHz Wi-Fi or a cable; fix access point placement and channels. * 7\. Turn on QoS, WMM or smart queue management on the router. * 8\. Swap the headset or device. * 9\. Send your provider the evidence (below). If the trouble is on the internet line, send it to your internet provider too. * 10\. If upload speed is maxed out at busy times, upgrade the plan or add a second connection for calls. ## What to send your provider * The date, time and time zone of a few bad calls, and the numbers involved. * Which direction was bad: you hearing them, them hearing you, or both. * Whether it happens on a cable, on Wi-Fi, or both, and on which devices. * Your test results, with screenshots, from a cable and from Wi-Fi. * What you've already changed (SIP ALG off, VPN off, router restarted). Providers can look up call records by time and number and see the call's quality stats from their side, which settles quickly whether the problem is your network or theirs. ## What Chargezen does instead Most VoIP problems hurt most when they hit the one person who was supposed to answer. Chargezen takes a different approach to the business line: Concierge answers every call on your number with AI, and your team steps in only on the calls that need a person. * **Concierge answers on your number**: Concierge answers calls and texts on your US business number with AI, day and night, from the instructions and details you give it. See the [AI receptionist](https://chargezen.com/concierge/use-cases/ai-receptionist) and the [phone channel](https://chargezen.com/concierge/channels/phone). * **Teammates join from Finn or the browser**: Listen in with your microphone off, tap Join the call, and Concierge tells the caller you're there. From the Finn app on iPhone or Mac you can transfer the call to a teammate with a note. See [phone calls](https://chargezen.com/concierge/features/phone-calls) and the [join and transfer guide](https://chargezen.com/docs/concierge/phone/join-and-transfer-calls). * **One thread per customer**: Everything said on the call, by Concierge and by your team, is saved in the customer's conversation with their texts, so a callback starts where the last call left off. * **Keep the number customers know**: Get a new local or toll-free US number, or [bring your existing number](https://chargezen.com/concierge/features/bring-your-number). Teammates who join from the browser use their computer's microphone and speakers, so the advice above applies: a wired headset and a cable connection give the cleanest audio. The browser call bar has a Speaker picker for choosing the right output. To be plain about it: Chargezen doesn't sell VoIP lines, desk phones or a phone system (PBX). It has no phone menu, ring groups, call forwarding or simultaneous ring, and its numbers are US (+1) only. If you need extensions on desk phones, a VoIP provider is still the right tool. Concierge Starter is $20 a month with 20,000 credits. Pro is $199 a month with 199,000 credits, or $1,990 a year. Phone and text charges are billed as used, with no per-user fees. See [pricing](https://chargezen.com/pricing). Related terms: [VoIP](https://chargezen.com/glossary/voip-voice-over-internet-protocol), [voice AI agent](https://chargezen.com/glossary/voice-ai-agent) and [warm transfer](https://chargezen.com/glossary/warm-transfer). Related guides: [VoIP jitter, latency and packet loss](https://chargezen.com/blog/voip-jitter), [how to stop echo on phone calls](https://chargezen.com/blog/how-to-stop-echo-on-phone-calls) and [what missed calls cost a business](https://chargezen.com/blog/missed-customer-calls). See also [what Wi-Fi calling is](https://chargezen.com/blog/what-is-wifi-calling) and [VoIP security](https://chargezen.com/blog/voip-security). ## Frequently asked questions ## Is VoIP less reliable than a landline? It depends on your internet connection. On a stable wired connection with room to spare, VoIP calls are as clear as a landline. Most VoIP complaints trace back to Wi-Fi, a full upload or router settings, which you can fix. ## Will a faster internet plan fix my calls? Only if your connection is full. A voice call needs very little bandwidth (Twilio lists 40 kbps each way for the Opus codec). Jitter and packet loss from Wi-Fi or a busy queue won't go away with a faster plan. Test first. ## Should I always turn off SIP ALG? For most cloud phone services, yes. SonicWall's advice is to enable it only when your router maker or VoIP provider tells you to. If you aren't sure, ask your provider. ## Why does only one person in the office have bad calls? When the network is shared and only one person has problems, look at their device, headset, Wi-Fi signal at their desk, or a VPN they run that others don't. ![Jerry Abrahamson](https://chargezen.com/assets/blogpost2.32f70dbd.png) Written by ### Jerry Abrahamson Jerry is the Founder and CEO of Chargezen, helping brands build sustainable omni-channel businesses. With over 10 years of experience in omni-channel commerce and SaaS, he's passionate about helping brands create recurring revenue streams. [](https://twitter.com/chargezenjerry)[](https://linkedin.com/in/jerry-a) ## Related Articles [ ![What Is VoIP? A Plain-English Guide for Small Businesses](https://chargezen.com/og-default.png) DTC Strategy · 8 min read ### What Is VoIP? 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