Cable Forum - View Single Post - A Little Info For Anybody Considering Voip over NTL 1Mbps

TheBlueRaja · 23-02-2006, 22:50

Depending on what VoIP Codec is used will determine the amount of upload Bandwidth required.

Most will use either

G.711 (Best Quality) (64k) - 80Kbps with IP Overhead or
G.729AB (Compressed - Mobile Quality) (8k) - 24Kbps with IP Overhead.
G.723 (Really Compressed - Crappy Quality) (5.3kbps) - 16Kbps with IP Overhead.

Which roughly means that with a single 128k uplink you could have 1 x G.711 calls, 5 x G.729AB calls or 8 x G.723 Calls.

So if you have the option in your VoIP software you can now set it to what quality you desire depending on your line speed.

Basically anything above 128k should be G.711, however you can get away with it on 128k, its just if anything else is using much of the link - well - you may get a bit of chop.

23-02-2006, 22:50	#13
TheBlueRaja cf.mega poster Join Date: Dec 2003 Location: Baw deep in a munter Age: 50 Services: Initiations, rep rigging and orgies! Posts: 5,750	Re: A Little Info For Anybody Considering Voip over NTL 1Mbps Depending on what VoIP Codec is used will determine the amount of upload Bandwidth required. Most will use either G.711 (Best Quality) (64k) - 80Kbps with IP Overhead or G.729AB (Compressed - Mobile Quality) (8k) - 24Kbps with IP Overhead. G.723 (Really Compressed - Crappy Quality) (5.3kbps) - 16Kbps with IP Overhead. Which roughly means that with a single 128k uplink you could have 1 x G.711 calls, 5 x G.729AB calls or 8 x G.723 Calls. So if you have the option in your VoIP software you can now set it to what quality you desire depending on your line speed. Basically anything above 128k should be G.711, however you can get away with it on 128k, its just if anything else is using much of the link - well - you may get a bit of chop.