[Glossary](https://telxpress.com/glossary/) / Network # Packet loss **Packet loss** is the share of packets that never reach their destination; on a voice or video call even a small amount causes dropped words, frozen video and a line that seems to cut out. - Network - Updated October 11, 2026 - Written by the Telxpress advisory team 01 In depth ## What it is, why it matters and *what to ask a vendor* Web pages and email hide packet loss by resending; real-time calls cannot wait, so a lost packet is a missing slice of sound. Loss comes from congested links that discard packets, faulty cabling and connectors, duplex mismatches, interference on Wi-Fi, and overloaded firewalls. Call endpoints report it through RTCP (RFC 3550), which is where provider dashboards get their per-call statistics. For a growing business packet loss is the fault that is hardest to see and easiest to misattribute. A single damaged patch cord or a switch port negotiating badly can degrade every call that crosses it while every speed test looks fine. Cameras and backups sharing the same uplink add loss exactly when the office is busiest. Ask your network partner to test the cabling and switch ports that carry phones and meeting rooms, to look at per-call statistics from the phone platform rather than one speed test, and to confirm QoS on the uplink. Ask your internet provider what loss their service guarantees and how they measure it. 02 Related terms ## Terms that usually come up *alongside it* - Network ### [Jitter](https://telxpress.com/glossary/jitter/) Jitter is the variation in the time it takes voice or video packets to arrive; when it is high, a call sounds choppy or robotic because the receiving device cannot smooth the uneven stream. - Network ### [Latency](https://telxpress.com/glossary/latency/) Latency is the time a packet takes to travel from one end of a connection to the other; on a phone or video call, high latency makes people talk over each other and pause awkwardly. - Network ### [QoS (quality of service)](https://telxpress.com/glossary/qos/) Quality of service (QoS) is the network configuration that identifies time-sensitive traffic such as voice and video and gives it priority over downloads and backups, so calls stay clear when the network is busy. - Network ### [Structured cabling](https://telxpress.com/glossary/structured-cabling/) Structured cabling is the standardized, organized system of copper and fiber cables, patch panels, racks and outlets that connects every phone, computer, access point, camera and room system in a building to the network. 03 At Telxpress ## Where this shows up *at Telxpress* The pages and articles where this term does real work: what we advise, build and support. - Page ### [Business Networking, Firewalls & Managed Wi-Fi](https://telxpress.com/solutions/business-technology/networking/) Switching, routing, Fortinet firewalls, Ubiquiti and Cisco Meraki Wi-Fi and managed network services for offices that depend on reliable connections. - Page ### [Structured Cabling & Fiber Installation](https://telxpress.com/solutions/business-technology/cabling/) Structured cabling, fiber, racks and clean terminations for new builds, expansions and office moves across Orange County, installed by our own team. - Article ### [Boost Your VoIP Calls: Top Tips for Crystal Clear Communication](https://telxpress.com/insights/boost-your-voip-calls-top-tips-for-crystal-clear-communication/) The steps we check on a site visit when business calls sound choppy or delayed, in order, from bandwidth and QoS to hardware, failover and codecs. 04 Sources ## Public *references* The standard or law this definition rests on, as published by its owner. Fetched and checked on the review date above. - [RFC 3550, RTP: A Transport Protocol for Real-Time Applications (RTCP loss reports)](https://www.rfc-editor.org/rfc/rfc3550) rfc-editor.org Next step ## Want This Applied *to Your Business?* Book a free 30-minute AI readiness consultation. You'll leave with three AI opportunities specific to your business, whether you work with us or not. [Book My Free Consultation](https://telxpress.com/book/) [Take the Free AI Readiness Assessment](https://telxpress.com/ai-readiness/) [Or call 24/7: (949) 861-4500](tel:+19498614500) Last reviewed: October 11, 2026. Published by Telxpress, Irvine, CA.