All these calls will be taking place in a single location. No PSTN lines will be in use. All the calls should be placed through our VoIP provider thus the opt to use G729 codecs.
[quote]You biggest issue will be with bandwidth, you will need a lot! G729 uses about 32KB per call per direction. 200 * 2 * 32 = 12.5 MB/s or 2 DS2 lines. You dont necessarily need 200 two way connections as silence is not transmiteed and usually only one side of the conversation is talking at a time but if you squeeze the bandwith too low the call quality will suffer.
Also I would plan on at least 2 servers, figure about 100 simultaneous calls per server.[/quote]
As per calculations, I was under the impression that each G729 call would use about 14Kbps of bandwidth including network overhead. Which would take me to about 2.8Mbps of bandwidth. Was I mistaken?
Let me try to clarify a little more.
We want to do 200 simultaneous calls.
For all these 200 calls, we want to use G729 format.
All these calls will be placed through our VoIP provider most likely using soft phones.
What would the specifications be of a machine that could handle the transcoding of 200 simultaneous G729 calls?
Is my calculation of the bandwidth requirement correct? If not, what would be the bandwidth requirement of the 200 simultaneous calls?
If a machine that can handle 200 simultaenous G729 calls is not feasible, what would be the specifications on a box that could do half of that volume?
Thank you for your responses so far.