# Browser Call Audio Quality: What Matters | CallCeptor > Codec, echo cancellation, noise suppression and network paths: the four things that decide how a WebRTC call sounds, in plain language. Source: https://callceptor.com/guides/browser-call-quality-checklist/ ## What decides the audio quality of a browser call Codec, echo cancellation, noise suppression and network paths: the four things that decide how a WebRTC call sounds, in plain language. 4 October 2026 · 5 min read · By [the CallCeptor team](https://callceptor.com/about/#team) A browser call uses WebRTC. Most of what a caller hears comes from four things you can ask about. ### The codec Opus is the common choice for voice over the web. It adapts to the network and keeps speech clear at low bitrates. ### Echo and noise Echo cancellation stops the caller hearing their own voice. Noise suppression removes fans and street noise. Both should be on by default. Agents on speakers instead of headsets still cause echo, so give agents headsets. ### The network path Calls try a direct path first. Strict office firewalls block it, so a relay over TLS on port 443 is the fallback. Ask any vendor what happens behind a corporate firewall. ### Measure it Look for per-call quality stats, such as packet loss and delay, so a complaint can be traced to a cause. Written by the CallCeptor team, who build browser calling and call routing for Indian financial firms. Product details reflect what CallCeptor does today; anything on the roadmap is marked as such. This guide is general information, not legal or regulatory advice. Spotted a mistake? [Tell us](mailto:support@callceptor.com?subject=Correction%3A%20What%20decides%20the%20audio%20quality%20of%20a%20browser%20call). See [how we write](https://callceptor.com/about/#editorial). ### More guides - [Where to place a call button on a financial website](https://callceptor.com/guides/where-to-place-a-call-button/) - [A checklist for choosing a website call button](https://callceptor.com/guides/website-call-button-checklist/) - [How fast should you call back a missed website lead?](https://callceptor.com/guides/callback-sla-for-financial-firms/) - [IVR menu or routing by page: which sends callers to the right desk?](https://callceptor.com/guides/ivr-menu-vs-routing-by-page/) - [How to measure the calls your website never answers](https://callceptor.com/guides/measure-missed-website-calls/) - [How to see which campaign produced a phone call](https://callceptor.com/guides/track-phone-calls-with-utm-tags/) - [What is browser calling, and how does a website call actually connect?](https://callceptor.com/guides/what-is-browser-calling/) - [Click-to-call vs a phone number, WhatsApp or a contact form on a financial website](https://callceptor.com/guides/click-to-call-vs-phone-whatsapp-forms/) - [How to add a click-to-call button to WordPress, Wix, Webflow, Shopify or any website](https://callceptor.com/guides/add-call-button-to-website/) - [What happens when a desktop visitor clicks your phone number](https://callceptor.com/guides/tel-links-on-desktop/) - [Routing website calls by page: a setup for a firm with five desks](https://callceptor.com/guides/route-website-calls-by-page/) - [Setting a call recording policy for each department](https://callceptor.com/guides/call-recording-policy/)