- Does Ringcentral support G729 codec?
- Is the HD Voice feature the same as G729 codec?
Technically, Ring Central IP phones only need a bare minimum of 90kbps (kilobit-per-second) downstream and upstream connection to make calls. Ring Central uses G.711 for high and G.729 for low.
The G.711 algorithm is not new. It was originally introduced by Bell Systems in the 1970s and was formally standardized by the International Telecommunication Union (ITU) in 1988. Today, G.711 is commonly used in Voice over Internet Protocol (VoIP), also known as Internet telephony.
In G.711, the mu-law codec is used in North America, while the A-law codec is more common in the rest of the world. Both algorithms create a 64-Kbps digital output using an input sample rate of 8 kilohertz (kHz). G.711 employs a technology called packet loss concealment (PLC) that can minimize the practical effect of dropped packets. The effective signal bandwidth is reduced during silent periods by means of a process known as voice activation detection (VAD).
G.729 has several extensions or annexes. The two most common are G.729A and G.729AB. In G.729A, input frames are 10 milliseconds (10 ms) in duration and generated frames contain 80 bits. The input and output contain 16-bit pulse-code modulation (PCM) samples converted from or to 8-Kbps compressed data. The total algorithmic delay is 15 ms. In G.729AB, the parameters are the same as in G.729A with the addition of voice activation detection (VAD) in which the effective signal bandwidth is reduced when there is no audio input. A technology known as comfort noise generation (CNG) produces a small amount of background pink noise during pauses in speech to avoid user distraction that can be caused by intervals of absolute silence.
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