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Reply To: Erlangs calculation in a VoIP network

VoIP IT guy

thanks for your reply. first of all.

I was not clear explaining my point originally.

I of course see a relation between the erlang traffic model and the VoIP transport across an IP network (bandwidth concerns)

For my particular case I’m starting from the point of a VoIP deployment in LAN conditions (100 Mb network, even Gb links), and for the amount of calls that I will ultimately intend to support, my bottleneck is the PSTN access (because I depend on the PRI’s/ Analog trunks)

I guess I’m curious to know how the Erlang model applies to this case (when you have enough bandwidth to support even VoIP Linear codec calls.)

I am using the Erlang model to calculate the distribution of PRI trunk channels versus VoIP endpoints depending on our foreseen traffic needs an obtain the peak BHCA/BHCC/CCS/Erlang figures that this equipment must support

I am using the number of PRI channels, the amount of peak trafic (typical BHCA/BHCC rate) (% of acceptable calls lost due to circuit unavailables) to get the figures. But assuming that the IP network is not an issue for bandwidth concerns, I don’t see how a VoIP approach is different than a traditional approach (this is what I am curious indeed)

Our WAN VoIP traffic is minimal and to some extent not prioritary these days (Inbound PSTN still produces 98% of our traffic).

thanks anyway for the information

VoIP benigger