How to Handle Network Capacity for Video Conferencing

Video conferencing has transitioned from an occasional convenience to an essential daily tool for UK businesses. Microsoft Teams, Zoom, Google Meet, and other platforms are now the default communication method for internal meetings, client calls, interviews, and collaborative work sessions. Yet many businesses continue to struggle with poor video quality, dropped calls, audio delays, and frozen screens — problems that undermine productivity, frustrate staff, and project an unprofessional image to clients and partners.

The root cause of most video conferencing problems is not the software — it is the network. Video conferencing is one of the most bandwidth-intensive and latency-sensitive applications a business network carries. A single high-definition Teams call consumes 1.5 to 4 Mbps of bandwidth in each direction. When twenty employees are simultaneously on video calls, the aggregate demand can overwhelm networks that were designed for email and web browsing.

This guide explains how to assess, plan, and optimise your network capacity for reliable video conferencing, with practical guidance tailored to UK business environments.

Understanding Video Conferencing Bandwidth Requirements

Video conferencing bandwidth requirements depend on the platform, video quality, number of participants visible on screen, and whether screen sharing is active. Understanding these requirements is the first step toward planning adequate network capacity.

Microsoft Teams, the most widely used platform in UK business, requires approximately 1.5 Mbps upload and 1.5 Mbps download for a standard one-to-one video call. Group calls with multiple visible participants require up to 4 Mbps download and 2.5 Mbps upload. Adding screen sharing increases the requirement by an additional 1-2 Mbps. These are per-user figures — multiply by the number of simultaneous callers to calculate total demand.

Call Type	Download	Upload	Recommended Bandwidth
Audio only (Teams/Zoom)	60 Kbps	60 Kbps	130 Kbps per user
1:1 video call (HD)	1.5 Mbps	1.5 Mbps	3.5 Mbps per user
Group video (gallery view)	4.0 Mbps	2.5 Mbps	8.0 Mbps per user
Video + screen sharing	5.5 Mbps	3.5 Mbps	10 Mbps per user
Teams Town Hall (viewer)	1.5 Mbps	Minimal	2.0 Mbps per viewer

Assessing Your Current Network Capacity

Before making changes, you need to understand your current network performance. This assessment should measure three key metrics: bandwidth, latency, and jitter.

Bandwidth is the total capacity of your internet connection — how much data it can carry per second. Latency is the time taken for data to travel between your network and the destination — measured in milliseconds. Jitter is the variation in latency over time — high jitter causes choppy audio and stuttering video even when bandwidth is sufficient.

For acceptable video conferencing quality, you need: sufficient bandwidth to support all simultaneous calls plus other business traffic, latency below 150 milliseconds (ideally below 50ms), jitter below 30 milliseconds (ideally below 15ms), and packet loss below 1% (ideally below 0.1%).

Calculating Your Required Bandwidth

To calculate the bandwidth your office needs for video conferencing, estimate the maximum number of simultaneous video calls during peak hours. For a typical UK office with 50 employees, you might have 15-20 users on video calls simultaneously during the morning meeting window.

If each of those 20 users is in a group video call requiring 8 Mbps, you need 160 Mbps of bandwidth just for video conferencing. Add bandwidth for email, web browsing, cloud application access, file transfers, and other traffic — typically 1-2 Mbps per user for general business use — and you need approximately 260 Mbps total for a 50-person office.

This is a peak demand calculation. Average demand will be lower, but your network must handle peak demand without degradation. Many UK businesses discover that their existing broadband connection, which seemed adequate for email and web browsing, is woefully insufficient for widespread video conferencing.

Network Optimisation Strategies

Quality of Service (QoS)

Quality of Service is a network configuration that prioritises certain types of traffic over others. By configuring QoS on your network switches and firewall, you can ensure that video conferencing traffic is given priority over less time-sensitive traffic like file downloads or software updates. Even when the network is heavily loaded, QoS ensures that video calls receive the bandwidth, latency, and jitter performance they need.

Microsoft Teams uses specific port ranges and protocols that can be identified and prioritised by QoS-capable network equipment. Configure your network to prioritise UDP traffic on ports 3478-3481, which carry Teams media (audio, video, and screen sharing). Most enterprise-grade firewalls and managed switches support QoS configuration.

Network Segmentation

Separating video conferencing traffic from other network traffic using VLANs can improve performance. Place video conferencing endpoints on a dedicated VLAN with QoS applied, ensuring they are not competing with file transfers, backups, or other bandwidth-intensive operations for network resources.

Wi-Fi Optimisation

Wi-Fi is often the weakest link in video conferencing quality. Wireless networks suffer from interference, contention, and signal degradation that wired connections avoid. For meeting rooms and areas where video conferencing is frequent, consider wired Ethernet connections rather than relying on Wi-Fi.

If Wi-Fi is unavoidable, ensure you are using Wi-Fi 6 (802.11ax) or newer access points, position access points to provide strong coverage in meeting rooms, use 5GHz bands rather than 2.4GHz for video traffic, and limit the number of devices per access point to avoid contention. In a busy UK office, a single consumer-grade Wi-Fi router is wholly inadequate — enterprise access points with proper site survey and placement are essential.

Internet Connection Upgrades

If your current internet connection cannot support your video conferencing requirements, upgrading is the most impactful change you can make. For UK businesses, the options range from FTTP broadband to dedicated Ethernet leased lines.

For offices with up to 25 users, a FTTP connection of 300-500 Mbps may be sufficient, provided the upload speed is adequate. For offices with 25-100 users relying heavily on video conferencing, a symmetric Ethernet leased line of 100-500 Mbps is recommended. The cost of a leased line — typically £200-800 per month depending on speed and location — is modest compared to the productivity losses caused by poor video call quality.

Consider a dual-WAN setup with automatic failover. A primary leased line for business-critical traffic and a secondary broadband connection for failover ensures that video conferencing continues even if your primary connection fails. SD-WAN technology can manage this automatically, routing traffic intelligently across both connections.

Monitoring and Ongoing Management

Network capacity management is not a one-time project — it requires ongoing monitoring. Implement network monitoring that tracks bandwidth utilisation, latency, jitter, and packet loss continuously. Set alerts for when metrics exceed thresholds that indicate potential video conferencing quality issues.

Microsoft Teams provides a Call Quality Dashboard that shows detailed metrics for every call made within your organisation. Use this data to identify users or locations experiencing quality problems, correlate issues with network events, and demonstrate the impact of network improvements. Regular review of call quality data helps you stay ahead of capacity problems before they affect users.