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VoIP Bandwidth Calculation
The codec determines the actual amount of bandwidth that the voice data will occupy. It also determines the rate at which the voice is sampled. The IP/UDP/RTP header can generally be thought of as a fixed overhead of 40 octets per packet, though on point-to-point links RTP header compression can reduce this to 2 to 4 octets (RFC 2508). The transmission medium, such as Ethernet, will add its own headers, checksums and spacers to the packet. Finally, some codecs employ silence suppression, which can reduce the required bandwidth by as much as 50 percent.

Newport Networks provides a tool to calculate the bandwidth your VoIP system .

Codec

Bandwidth

Codec & Bit Rate (Kbps)

Codec Sample Size (Bytes)

Codec Sample Interval (ms)

Mean Opinion Score (MOS)

Voice Payload Size (Bytes)

Voice Payload Size (ms)

Packets Per Second (PPS)

Bandwidth MP or FRF.12 (Kbps)

Bandwidth w/cRTP MP or FRF.12 (Kbps)

Bandwidth Ethernet (Kbps)

G.711 (64 Kbps)

80 Bytes

10 ms

4.1

160 Bytes

20 ms

50

82.8 Kbps

67.6 Kbps

87.2 Kbps

G.729 (8 Kbps)

10 Bytes

10 ms

3.92

20 Bytes

20 ms

50

26.8 Kbps

11.6 Kbps

31.2 Kbps

G.723.1 (6.3 Kbps)

24 Bytes

30 ms

3.9

24 Bytes

30 ms

34

18.9 Kbps

8.8 Kbps

21.9 Kbps

G.723.1 (5.3 Kbps)

20 Bytes

30 ms

3.8

20 Bytes

30 ms

34

17.9 Kbps

7.7 Kbps

20.8 Kbps

G.726 (32 Kbps)

20 Bytes

5 ms

3.85

80 Bytes

20 ms

50

50.8 Kbps

35.6 Kbps

55.2 Kbps

G.726 (24 Kbps)

15 Bytes

5 ms

 

60 Bytes

20 ms

50

42.8 Kbps

27.6 Kbps

47.2 Kbps

G.728 (16 Kbps)

10 Bytes

5 ms

3.61

60 Bytes

30 ms

34

28.5 Kbps

18.4 Kbps

31.5 Kbps

 

                             [ 5 Steps to VoIP ]
                                 by: Olivia Tan

So you’re ready to enjoy unlimited long distance calling and lower monthly phone bills. Well, before you make the switch, here are five steps that will help you get the VoIP plan that is best for you.

Make the Decision

Yes, it is new technology, and sometimes we are scared of the unknown. VoIP technology is on the rise and many high profile computer companies are already switching to VoIP and in return are becoming service providers. AOL, Sprint, and Verizon are offering VoIP as well as Internet Messaging services such as Yahoo, MSN, and AOL IM. First you must come to the decision that VoIP is best for you, your family, or your business needs. Research VoIP on the web and its providers. Talk to people that you know have already made the switch. Once you have made your decision to switch to VoIP, you are ready for the next step.

Choose the Plan that is Right for You

A good idea is to make a written list of your needs, wants, and features in a phone. This will help you compare different plans and choose the service provider that will best fit your needs. If you are looking for residential or business service, make sure that you note that in your list. Residential plans usually come in two forms- basic (which is a certain amount of minutes) and unlimited (which will give you unlimited local and long distance talk time). Business plans can include amenities such as multiple phones, greater minute talk time, greater unlimited calling plans, business features bundled with your plan, faxing and voicemail to your computer capabilities, and extras such as yellow page listings. Check with the company to find the plan that meets your requirements.

Setting up the System

Some service providers will send you the equipment that you need to begin using VoIP. You will first need to make sure that your computer system is compatible with the VoIP service. You will also need to have high speed Internet already installed with your computer. If you are using VoIP for a business or for a call center, it is best to leave the installation to a professional. Installing VoIP for a residence or home office is typically simple enough for most residents to do themselves.

Choosing your Phone Number

One of the best features that VoIP has to offer is the freedom to select your own telephone number. If you just want to transfer your old number to your new VoIP system, check with your service provider before making your final decision. Many VoIP providers will allow you to transfer your phone number.

If you want to select a different area code, this option has many advantages. First, for friends and family members who don’t have unlimited long distance calling, selecting the same area code as them can save them money. They will appreciate being able to call you as if it were a local call.

This strategy is also very beneficial for those whose businesses are targeting specific areas. Say there is a California company, yet they want to increase business in Tampa, Florida. By selecting the Tampa, Florida area code, they can increase sales and productivity by having a local number for customers to call. This also reduces the need for a toll free number.

Install your Features and Accessories

VoIP comes with many features included in your service plan. For residential customers these include Voicemail, Caller ID, Call Forwarding, Call Block, and Do Not Disturb. Always check with your service provider for a detailed listing of the features included with your plan. For Small businesses, amenities such as multi phone users, free fax lines, and integrating your VoIP and web features are all available. VoIP also contains many of the same features bundled with basic plans as well. When you are choosing a provider, compare their business plans and select the one that best fits your business needs.

As VoIP technology continues to advance, a new array of accessories appears on the market. Today you can choose from VoIP phones, headsets, and even VoIP videophones that work as a web camera incorporating video with your audio.

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