Codecs en bandbreedte
Its not necessary to calculate your codec bandwith usage anymore.
Its possible to find it in complete datasheets on the web.
We speakup are narrowing it down to 4 or 5 common used codecs.
64 kb oneway: Delivers precise speech transmission. Very low processor requirements. Needs at least 128 kbps for two-way.
16/24/32/40 kb oneway: An improved version of G.721 and G.723 (different from G.723.1)
8 kb oneway: Excellent bandwidth utilization. Error tolerant. License required.
48/56/64 kb oneway: Adapts to varying compressions and bandwidth is conserved with network congestion.
13kb oneway: High compression ratio. Free and available in many hardware and software platforms. Same encoding is used in GSM cellphones (improved versions are often used nowadays).
We like to be on the safe side and calculate a certain overhead.
So for a general sip calls we advise to calculate around 80 tot 100kbit bandwith for a two way route.
If you want to calculate it on specific levels then please use this website:
http://www.bandcalc.com/