Page Comparison

Codec

Description

AMR

AMR is an audio data compression scheme for speech encoding. AMR is used in GSM and UMTS networks. AMR encodes narrowband signals at variable bit rates ranging from 4.75 to 12.2Kbps. (RFC 3267).

AMR-WB

Refer to the topic for information on this codec. (RFC 3267).

Clear Channel

Refer to the Clear Channel Codec Support topic for information on this codec.

G711 alaw

Also known as PCM (Pulse Code Modulation). Has a 64 Kbps bitrate and is primarily utilized in most countries outside North America.

G711 ulaw

Also known as PCM (Pulse Code Modulation). Has a 64 Kbps bitrate and is primarily utilized in North America.

G723 5.3 Kbps

Standard speech codec which uses ADPCM. Transmits at 5.3Kbps.

G723 6.3 Kbps

Standard speech codec which uses ADPCM. Transmits at 5.3Kbps.

G729

Audio data compression algorithm for voice. Used primarily in VoIP applications where bandwidth must be conserved.

G722

An ITU-T standard 7 kHz wideband speech codec operating at 48, 56 and 64 kbit/s. G.722 sample audio data at a rate of 16 kHz (using 14 bits), double that of traditional telephony interfaces, which results in superior audio quality and clarity. G722 64 bit is supported in BDN.

iLBC 20ms

This is the Internet Low Bit-rate Codec which is approved as a standard codec by IETF as RFC 3951. It operates on 8 kHz speech frames of 20 ms corresponding to rates of 15.2 kbps.

iLBC 30ms

This is the Internet Low Bit-rate Codec which is approved as a standard codec by IETF as RFC 3951. It operates on 8 kHz speech frames of 30 ms corresponding to rates of 13.3 kbps.

GSM-FR Static Payload Type

A GSM full-rate wireless codec based on GSM 06.10 with a frame size of 20 ms and operates on 8 kHz speech. It is based on ETSI standards. The bit rate is 13.2 kbps.

GSM-FR Dynamic Payload Type

Same as GSM-FR but supports a dynamic payload.

G726-32/G721 Static Payload Type

G.726 is a standard voice codec which traditionally supports transmission rates of 16, 24, 32 or 40 kbit/sec.  The IMG 2020 supports only the 32 kbit/sec rate which is optimal for voice transmission, and is also referred to as G.721.  This codec uses a default static payload type of 2.

G726-32/G721 Dynamic Payload Type

Same as G.726-32/G.721 but supports a dynamic payload type in the 96 - 127 range.

GSM-EFR

GSM-EFR denotes the GSM 06.60 enhanced full-rate coding, specified in ETS 300 726. It has a frame size of 20 ms and operates on 8 kHz speech. The bit rate is 12.2 kbps.