Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium



Posted on 2004-11-11
Medium Priority
Last Modified: 2010-04-12

Could anyone give me a rough estimate of how much bandwidth 5 simultaneous voice calls would take, on cisco IP phones.

Question by:adam_pedley
  • 2
LVL 15

Accepted Solution

scampgb earned 1800 total points
ID: 12553062
Hi adam_pedley,

This would depend on the codecs being used.

If the phones are using G711 (uncompressed, 64 Kbps) - this would be 400Kbps
If they're using G729a they would need 120Kbps

Take a look at http://www.voip-info.org/wiki-Codecs for information on the various codecs.  There are some very useful calculators at http://www.voipcalculator.com/calculator/

http://www.voip-info.org/wiki-Bandwidth+consumption is also a very useful starting point.

Does this help?

LVL 12

Assisted Solution

Joel_Sisko earned 200 total points
ID: 12557394

In regards to the bandwidth, it is depenedant not only on the codec used, but also features that may be used on your network such as VLAN, Qos, VPN information.This addtional information is known as overhead.

Below is a link to a information specific to Cisco IP Phones, this would be a better palce to start since you are using Cisco phones.


If you like to see more detailed information on this issue that is not Cisco centric, this link provides a little more detail and graphics:


Are you just doing some research or looking to deploy VoIP wihtin in your network? If you need addtional help on design or implementation issues, let us know.

Kindest regards
LVL 15

Expert Comment

ID: 12578775
Glad I could help :-)

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I recently purchased a Bluetooth headset called the Music Jogger (model BSH10). The control buttons on it look like this: One of my goals is to use it as the microphone and speakers for Skype calls. In that respect, it works well. However, I …
Skype is a P2P (Peer to Peer) instant messaging and VOIP (Voice over IP) service – as well as a whole lot more.
Loops Section Overview
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
Suggested Courses

564 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question