Ok, how many concurrent phone calls can "fit" in a full-duplex 100 megabit connection? For that matter how much bandwidth does a VoIP call require?
This is the scenario I'm picturing: an Asterisk server connected via 100 meg/fd to a T1 via Digium card of some kind. VoIP to analog server (as mentioned) connected to a 100 megabit LAN. Other Asterisk servers talk to the VoIP to analog gateway across the larger LAN/MAN (dedicated bandwidth, mostly across a fiber network with a good deal of bandwidth).
So, I'm thinking of the Asterisk/Digium server being what one could consider a VoIP/analog gateway of sorts much like a firewall or VPN concentrator would function as a IP input/output for a, well, IP network.
Hence.. how much bandwidth does one VoIP require to the voice gateway?
UPDATE..
Also, does it help to have a VoIP server that talks to the Asterisk gateway? Should the phones all talk to the gateway themselves? Can an IP only Asterisk server compress traffic to the gateway? Is that more efficient or less?
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2 comments:
Well, T1s were designed to multiplex voice channels. Each T1 channel is 64Kbps of uncompressed voice. Figure about a 20% overhead per channel for VOIP and packet headers and there's your bandwidth per channel. And don't forget that a phone call is two channels: one in either direction.
I'm sure Jon will jump in here with exact figures, but that gets you going.
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