Bandwidth Calculator

Sizing for cameras, SIP and paging

Cameras

CamerasResolutionCodecSub-stream overhead %Local live view, multi-tile dashboardsRemote viewersConcurrent streams off-site

3 Mbps / cam

SIP active callsSIP codecPaging speakers (multicast)Paging stream (Mbps)Multicast = same load regardless of speaker count

Other upload (Mbps)Cloud DVR, alarms, access controlHeadroom %Recommend 30–50% above peak

Recording → NVR

24.00 Mbps

Sub-stream / live

3.60 Mbps

SIP + paging

0.174 Mbps

Total LAN peak

27.77 Mbps

Upload required

8.17 Mbps

Download required

1.17 Mbps

Upload + 30%

10.63 Mbps

Download + 30%

1.53 Mbps

Recommended circuit: 25/25 Mbps symmetrical. Estimated egress if all remote streams run 24/7: 9720 GB / month.

Camera bitrates are average (CBR estimate). Actual VBR peaks can be 1.5–2× higher in motion.
Paging is multicast — bandwidth is constant whether 1 or 100 speakers, but IGMP snooping must be on.
SIP signalling itself is negligible (~1 kbps); the numbers shown are RTP audio with overhead.
Always size the WAN with headroom for backup, OS updates and tech remote sessions.