Bandwidth Calculation

This document explains how to calculate the maximum number of concurrent call participants based on server bandwidth.

Theoretical Calculation

Based on 1 person at 720p + others at 360p video quality configuration:

Bandwidth = 0.45 × N² + 1.25 × N (Mbps)

Where N = number of concurrent call participants

Calculate maximum supported participants based on server bandwidth:

N = (-1.25 + √(1.5625 + 1.8 × B)) ÷ 0.9

Where B = server bandwidth (Mbps), result rounded down

Server Bandwidth	Max Participants	Actual Consumption	Calculation
50 Mbps	9 people	47.7 Mbps	0.45×81 + 1.25×9 = 47.7
100 Mbps	13 people	92.3 Mbps	0.45×169 + 1.25×13 = 92.3
150 Mbps	16 people	135.2 Mbps	0.45×256 + 1.25×16 = 135.2
200 Mbps	19 people	186.2 Mbps	0.45×361 + 1.25×19 = 186.2

Scenario: 1 person at 720p + others at 180p (small window display)

Actual bitrates used:

Bandwidth = 0.1 × N² + 0.9 × N (Mbps)

Server Bandwidth	Theoretical (720+360)	Optimized (720+180)	Improvement
50 Mbps	9 people	18 people	+100%
100 Mbps	13 people	27 people	+108%
150 Mbps	16 people	34 people	+113%
200 Mbps	19 people	40 people	+111%

Optimization Factor	Description
Dynamic Bitrate	Bitrate can drop to 30% when video is static
180p for Small Windows	Saves 60% bandwidth compared to 360p
Dynacast	Pauses sending streams no one is watching
Audio Priority	Automatically reduces video quality on poor network
Codec Optimization	VP8/H264 actual bitrate is lower than nominal

Choose appropriate server bandwidth based on business needs:

Tip

Actual supported participants depend on video quality settings. Enabling 180p small window mode can significantly increase concurrent participants.