Bandwidth use per call?

General Help
1

Hi,

I’m wondering if anyone can tell me the approximate bandwidth use on a per-call/per-minute basis.

I understand this varies based on codex used, but I’m hoping someone can provide figures for a standard deployment using default settings.

My specific example:

  • FreePBX 2.9.0.7
  • Cloud server running CentOS 5.6
  • SIP trunk

Three example scenarios:
(for all scenarios assume a 1-minute call with lots of talking at full volume)

  1. Call comes in through SIP trunk -> IVR -> Ring Group -> Extension
  • The extension is a SIP client phone handset on my home internet connection.
  1. Call comes in through SIP trunk -> IVR -> Ring Group -> Extension
  • The extension is a cel phone, 15551234567#
  1. Call is placed from SIP client phone handset on my home internet connection
    -> PBX -> SIP trunk

In each of those 3 scenarios, how much bandwidth would be used for the one-minute call?

Many thanks,
1337ingDisorder

2

You can answer your own question by making a call and then watching the System Status page on FreePBX. Note that the figures reported there are in kilobytes, and not kilobits, so you have to multiply them by 8 to get kilobits per second. My experience has been 20-30 kilobytes per second per call using G.711.

3

All this information and you did not mention the only relevant which is what CODEC are you talking about?

4

http://www.bandcalc.com/

5

I shall do so.