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To create or modify a Voice Codec Profile:
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From the Create Media Profile drop down box at the top of the Media Profiles page, select Voice Codec Profile.
From the Codec drop down box, select a codec.
Configure the files Complete Voice Codec Configuration fields (see Field Definitions below), and click OK. See field definitions below.
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| 0 | Figure |
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| 1 | Create Voice Codec Profile |
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Voice Codec Profiles - Field Definitions
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| Parameter | Description |
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| Description | A name/description for the codec. | | Codec | Specifies the voice codec and encoding scheme used towards the IP side of a VoIP call. The |
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chosen selected codec affects the audio quality and bandwidth consumption of VoIP calls to which you apply |
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this the Voice Codec Profile (in the Media Profiles List |
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Profile for codec will depend depends on the interoperability requirements for connecting to other voice peers |
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, as well as on the and bandwidth requirements. Most codecs use data compression algorithms, which saves |
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the , it slightly reduces the voice quality |
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, whereas . G.711 does not use compression and |
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therefore most bandwidth.Note: The G.722.2 Codec only appears in the list box if the AMR license is installed.
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- G.722 Wideband Codec: this codec supports only 20ms packet sized and a bit-rate of 64Kbps.
- There is no fax data tone detection support in the G.772 or AMR-WB channels.
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more bandwidth. The following codecs are supported on platform: |
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- G.711 A-Law
- G.711 u-Law
- G.722
- G.722.2
- G.723.1
- G.726
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Codec - Additional Specifications - G.722 Wideband Codec: Supports 20ms packet sized and a bit-rate of 64Kbps only.
- G.722 or AMR-WB channels: Does not support fax data detection support.
- G.722.2: Appears only if the AMR License is installed.
- G.726: Supports
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- G.729: Supports G.729A and G.729AB
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- . The variant used when selecting
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- depends upon the setting of Media List flag
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- . If Silence Suppression is enabled, G.729AB is used.
- Opus: Supported in SBC SWe Lite only.
NOTE: Applicable to SWe Lite initiating FAX setup. A G.711 codec must be used for fax detection; tones are detected on the G711 egress (answering CED tone) leg. Otherwise the peer has to initiate fax path. | | Rate | Specifies the voice sampling rate in bits/sec |
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to be setting parameter applies to G.722.1, G.723.1 |
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and , G.726, and Opus codecs only. |
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For example: the codec sample interval for G.711A-Law and G.711u-Law is 10 ms.Therefore, the voice payload sizes are For all other codecs, the voice sampling rate is fixed and defined in the appropriate specification for that codec. | | Payload Size |
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Specifies (indirectly) the number of bytes in a single packet. The payload size is a multiple of the codec sample size.
The recommended length of time in milliseconds rounded up to the next full integer value represented by the media in a packet. Valid entry: 10, 20, 30, 40 |
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, 50. The codec sample interval for G.723.1 is 30 ms and therefore the payload sizes are 30, 60, 90, 80, 90 (specific codec determines values available). - Smaller payload sizes decrease audio transport latency at the expense of higher bandwidth consumption.
- Larger packet sizes reduce the
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use of - bandwidth. The larger the payload size, the fewer and larger the packets.
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When - With larger payload sizes
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are used headers as well as fewer - and IP/UDP/RTP headers are used
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. The - ; a disadvantage is that if UDP packets get lost, the impact on the voice quality
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will be much - is higher because a single packet contains more raw voice data.
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Total packet size = (L2 header: MP or FRF.12 or Ethernet) + (IP/UDP/RTP header) + (voice payload size)
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For Re-Invite Only: If the SBC receives a larger than configured payload size from the peer offer in the re-invite, the SBC rejects with a 488 'Not Acceptable Here' response. The call rolls back to the previous negotiated offer answer. | | Payload Type | Specifies the payload type for this profile. |
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Only available when either and is the specified codec, and Opus codecs only. | Payload Format
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the payload format for this profile. This field is only available when the the mode for the payload: Bandwidth Efficient Mode or Octet Aligned Mode. Default entry: Bandwidth Efficient Mode. This setting applies to G.722.2 |
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codec is selected- Bandwidth-Efficient Mode
- Octet-Aligned Mode
For a given session, the payload format can be either bandwidth efficient or octet aligned, depending on the mode of operation that is established for the session via out-of-band means. In the octet-aligned format, all the fields in a payload, including payload header, table of contents entries, and speech frames themselves, are individually aligned to octet boundaries to make implementations efficient. In the bandwidth-efficient format, only the full payload is octet aligned, so fewer padding bits are added.
| Voice Bit Rate | The maximum Opus bit rate (in bits/second) used for the current session. Valid entry: 0 (use variable bit rate) or 1 (use constant bit rate). Default entry: CBR. Parameter applies to Opus only. | | Use FEC | Specifies whether to use Forward Error Correction (FEC). Valid entry: 0 (do not use FEC) or 1 (use FEC). Default entry: 0. Parameter applies to Opus only.
| | Use DTX | Specifies whether to use Discontinuous Transmission (DTX). Valid entry: 0 (do not use DTX) or 1 (use DTX). Default entry: 0. Parameter applies to Opus only.
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