All phones should use the G.711 codec where possible requiring 80 Kbs. The G.729 codec is used as a fall-back and requires 16 Kbs.
These rates are per call and we recommend doubling these numbers when reserving bandwidth. This means that for a single phone you should reserve 160Kbs when using the G.711 codec and 32Kbps when using the G.729 codec.
Other codec’s are available but not currently supported by our systems, their bandwidth requirements will fall somewhere between the two codec’s above.