Calculate VoIP bandwidth with overhead
Estimate per-call VoIP bandwidth by adding packetization and header overhead to codec bitrate.
VoIP packet bandwidth estimate Payload per packet Codec bitrate multiplied by packetization interval. Add headers Include RTP, UDP, IP, and relevant Layer 2 or tunnel overhead. Multiply packet rate Packets per second equals one divided by packetization interval. Add headroom Reserve capacity for bursts, signaling, and other traffic. Can a 10 Mbps branch link support 40 simultaneous G.711 calls with 20 ms packetization? Payload + headers + packet rate + headroom The common shortcut is multiplying 64 kbps by call count and forgetting that RTP voice is carried as many small packets with headers. Payload G.711 at 64 kbps over…
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