Bandwith requirements VOIP, H323, Codec G.927 and Frame relay
I am calculating the amount of bandwith that I have to reserve (QoS) on my WAN in order to support VOIP using the codec G.729 and H323. My WAN is built using Frame-Relay and since my CIR is 512 Kbps I will be using cRTP. Also note that I am using a PBX solution from Ericsson not Cisco, only my network components are from Cisco.
My calculation show me that I will need 12 Kpbs for each voice channel (please correct me if I am wrong). Now my question is how much bandwidth do I have to reserve for call control (signaling)
Re: Bandwith requirements VOIP, H323, Codec G.927 and Frame rela
Call Control is much less predictable, at least in terms on maximum bandwidth required, than the voice traffic itself. However, the bulk of the traffic, the H.245 and H.225, is transmitted before the voice path is setup. And it is safe to say that the setup traffic should be less bandwidth intensive than the voice traffic itself.
However, in band control during the call is over and above the bandwidth required by the voice. This call control is handled by RTCP (Real Time Control Protocol) and the specification states that this should never take more than 5% of the bandwidth used by the RTP stream. So in this case, 3 Kbps/call would seem sufficient to me.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...