Calculating VoIP Bandwidth

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One of many first issues a corporation has to do when contemplating VoIP deployment – whether or not on premise or hosted providers – is to calculate how a lot bandwidth is required for VoIP calls. Bandwidth consumption needs to be estimated early on as that can decide if the enterprise wants to extend Web speeds or in any other case optimize their community.

There are a lot of on-line instruments that can routinely calculate VoIP bandwidth and any service supplier will be capable to present a desk displaying bandwidth consumption per name on their service. Nonetheless it’s higher for the enterprise to understand how these figures are calculated, since unscrupulous distributors can attempt to trick shoppers with deceptive calculations.

What Impacts VoIP Bandwidth Consumption?

Among the components that affect VoIP bandwidth embrace:

Codec and compression used (G.711, G.729, G.722 or some other proprietary codecs)

Header compression – (RTP + UDP + IP as an example),that is typically elective

Particular person packet dimension – anyplace from 10 to 320 bytes

Layer 2 protocols corresponding to Body Relay or Level-To-Level Protocol

Voice detection or silence suppression know-how

Calculating VoIP bandwidth consumption is a necessary step in getting ready a enterprise community for the addition of voice visitors. Bandwidth consumption reduces if compression is used. Which means codecs like G.729 will use much less bandwidth as in comparison with G.711. When longer packets are used, bandwidth consumption drops for the reason that overhead is lowered i.e. area taken up by the header. If the voice is being compressed, it’s higher to compress the header information as effectively to supply most financial savings. Packet dimension is normally between 20 to 30 ms on totally different providers.

Calculating VoIP Bandwidth

Suppose the service supplier makes use of G.729 codec on their community. If the dimensions of every voice packets is 20 bytes and makes use of MP headers, the calculation can be as follows:

Whole packet dimension = header of 48 bits + compressed IP/UDP/RTP header of 16 bits + voice payload of 160 bits = 224 bits

PPS = (8 Kbps codec bit price) / (160 bits) = 50 pps

Bandwidth per name = voice packet dimension (224 bits) * 50 pps = 11.2 Kbps

This ultimate determine offers us the bandwidth required on a per name foundation. To get a tough concept of the utmost bandwidth consumption, the enterprise must multiply this quantity with the very best variety of concurrent calls they count on. Calculating VoIP IP bandwidth is fairly easy as soon as you already know the components and the way they affect the ultimate calculation.

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