How To Fix G729a Codec Bandwidth?

How To Fix G729a Codec Bandwidth?

In this guide, we describe some of the possible causes that can lead to the throughput of the g729a codec, and then we describe possible solutions to this problem.

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    G.729 codecs use about 24-30 Kbps. If someone is willing to sacrifice call charges, your ISP may be using a specific codec called G.723.1.

    g729a codec bandwidth

    G.729 is a free narrowband vocoder-based audio compression algorithm for personal data that uses a new frame length of 10ms. It’s officially described as speech-specified coding.at 8 kbps, creating the use of code-excited linear predictive speech coding (CS-ACELP), so it was introduced in 1996.[2] The G.729 extension is called G.729.1, which complies with Annex J G.729.

    Because of its low bandwidth requirements, G.729 is undoubtedly primarily used in VoIP (Voice over Internet Protocol) applications where data backup is required. The G.729 standard operates at a data rate of nine kbps, but extensions offer half speeds, 0.4 kbps D (Annex F, H, I, C+) and 11.8 kbps (Annex E, H) . , g , I, C+) for deeper or better voice quality.

    G.729 has been augmented by several general aspects, referred to as G.729a and G.729b:

  • G.729: This is the original codec using a new, very complex algorithm.
  • G.729A or Annex A: This version supports and is type-compatible with G.729. Voice quality is slightly lower.
  • G.729B or possibly an application. This version b: adds silence suppression to G.729 and is definitely incompatible with previous versions.
  • G.729AB: This version adds suppressionand quiet atmosphere to G.729A and is only compatible with G.729B.
  • G.729.1 or Annex J: This release extends G.729A and B with a design scale variable using hierarchical extension levels. It supports Discrete Cosine Alter (MDCT) Modified Wideband Speech-to-Audio Transformation.[3]
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  • Dual Tone Multi-Frequency (DTMF), fax transmission, and high-quality audio cannot be reliably transmitted using this codec. DTMF requires the use of telephone events with a mission header in the RTP payload for telephone digits, tones, and optional DTMF telephone tones, as specified in RFC 4733.

    G.729 Appendices

    Function G.729 Attachments [4]

    A B С


    E F G N me C+

    J Low Difficulty

    Х Х

    fixed point Х Х Х

    Х Х Х Х Х Х

    X Floating point



    8 kbps Х Х Х Х Х Х Х Х Х Х Х X 6.4 kbps



    Х Х Х

    11.8 kbps


    Х Х Х Х



    Х Х

    Х Х

    Built-in variable bit rate, broadband access


    G.729 Annex A

    G.729a is a compatible extension of G.But 729, but requires less processing power. However, this lesser complexity carries with it the reproach of somewhat reduced voice quality.

    G.729a was developed by a consortium of France Telecom, Electric Mitsubishi Corporation, Nippon Telegraph and Telephone Corporation (NTT).

  • 8 kHz/16 bit random sampling (80 samples for 10 Microsoft Windows frames)
  • Fixed bit rate (8 kbps, ten ms frames)
  • Fixed frame size (10 bytes (80 bits)for 10 frames)
  • Microsoft’s algorithmic latency is 15ms per frame, with a 5ms lookahead latency.
  • G.729a is clearly a hybrid speech encoder that includes Code Excited Algebraic Linear Prediction (ACELP)
  • Algorithm complexity is estimated at 15 using relative slope, where G.711 is 1 and G.723.1 is 25.
  • Testing PSQM under ideal conditions yields an average opinion score of 4.04 for G.729a compared to 4.45 for G.711 alone (μ-law)[quote]
  • PSQM testing in place yields an average stress opinion of 3.51 for G.729a compared to 4.13 for G.711 (μ-law)
  • How much bandwidth does a call take?

    How is throughput measured? Throughput is measured in kilobytes per second (kbps) or megabytes per quarter (MB/s). Most calls require almost 64Kbps of bandwidth, and you can receive about 12 calls at the same time with 1Mbps of bandwidth. To hold 120 calls at the same time, you need 10 Mbps, which indicates throughput.

    Some VoIP phones incorrectly use the description “G729a/8000” in SDP (for example, this affects some Linksys phones from And “Cisco”). This is incorrect because G729a is an alternative audio coding method but still generates decodable data from G729 plus G729a, i.e. there is no discrepancy in terms of codec rules. Since the SDP RFC allows noise payload types to be overridden due to the rtpmap textual description, this could potentially cause problems when called from these mobiles phones to RFC compliant endpoints unless the codec is renamed in their settings because they are not . I don’t recognize “G729a” as “G729” without a custom workaround for the exact error.

    G.729 Annex B

    g729a codec bandwidth

    G.729 has been extended in an application (G b.729b) that provides a method for silence compression and includes a VAD (Voice Activity Detector) module. It is used to detect signal activity. It also includes a Discontinuous Display (DTX) module that decides to update specific background noise settings for non-speech (noisy images). It uses the returned 2-byte silence insertion descriptor (SID) frames to initiate comfort noise generation (CNG). By inserting comfort analog noise, the hiss during silence can be digitally simulated to reassure the receiver that the link is up and running.

    Annex J G.729 (G.729.1)

    How are G 711 and G 729 codecs different?

    Different codecs offer different levels of compression. The G711 delivers powerful, high-quality, uncompressed voice but uses more bandwidth. The G729 is undoubtedly so compressed that it consumes a lot of bandwidth at the expense of sound quality, although this is more than enough for many calls.

    G.729 Annex J, supported with G.729.1, supports wideband voice and audio. Introduced in 2006, [3] is a specificvariable rate broadband expansion defines the use of 12 to 12 hierarchical levels. The base layer is a G.729 bit stream at 11 kbps, the second layer is considered the narrowband enhancement layer at 4 kbps, and the third stage at 2 kbps is the enhancement layer. The other layers provide broadband extension in 2 kbit/s increments. G.729.1 includes three-stage coding: code-excited embedded linear prediction (CELP) coding of the lower band, parametric coding of the upper musical band with Time Domain Bandwidth Extension (TDBWE), and further enhancement of the whole band with a transform predictive coding algorithm , commonly referred to as time-domain-aliasing-cancel (TDAC), also known as modified discrete cosine rotation coding (MDCT).

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    G729a Codec Bandbredd
    Ancho De Banda Del Códec G729a
    G729a Codec-bandbreedte
    Полоса пропускания кодека G729a
    Przepustowość Kodeka G729a
    G729a 코덱 대역폭
    Larghezza Di Banda Del Codec G729a
    Largura De Banda Do Codec G729a
    Bande Passante Du Codec G729a