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VoIP Bandwidth Calculator: How Much Bandwidth Do You Need?
Voice over IP consumes less bandwidth than video but still needs accurate planning. The two key inputs are the number of concurrent calls and the codec used.
Codec Bandwidth
G.711 delivers toll-quality audio at roughly 87 kbps per call including protocol overhead. G.729 compresses voice to about 31 kbps per call, trading modest quality reduction for major bandwidth savings.
Simple Calculation
Multiply per-call bandwidth by peak concurrent calls and add a headroom margin of at least 25%. For example, ten concurrent G.711 calls need approximately 870 kbps; with 25% headroom, plan for 1.1 Mbps.
Include Other Traffic
The calculation above is for voice only. If the same link carries video, file transfers, or cloud backups, allocate additional capacity and implement QoS to protect voice from contention.
Measure, Don't Guess
Peak concurrent call volume often differs from extension count. Use call detail records or platform statistics to measure actual usage before sizing.
Redstone helps organizations assess bandwidth requirements as part of deployment planning.
Redstone Systems, Inc. founded in Delaware, USA in December 2002, has been the ODM vendor for many well-known communications companies, serving the Southeast Asian market. In 2020, Redstone Systems will begin to return to the North America market with its self-developed brand.
Redstone has a complete product line of intelligent voice gateways, providing IP-PBXs, analog VoIP gateways (FXS/FXO), digital VoIP gateways (E1/T1), border appliances, and session boundary controllers (SBCs).
With advanced technology in digital signal processor (DSP), speech coding and speech processing, as well as efficient operational tools such as cloud remote management, auto provisioning, Redstone gateways are widely used in markets of enterprise communications, cloud communications, call centers, operators’ IMS/SIP trunks, bringing users friendly, efficient and reliable communication experience.
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