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  1. From the Create Media Profile drop down box at the top of the Media Profiles page, select Voice Codec Profile.

  2. From the Codec drop down box, select a codec.

  3. Configure the files and click OK. See field definitions below.

    Complete Voice Codec Configuration fields (see Field Definitions below), and click OK.

     

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    1Create Voice Codec Profile

     

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Anchor
properties
properties

Voice Codec Profiles - Field Definitions

Caption
0Table
1Configure Codecs
ParameterDescription
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

chosen

selected codec affects the audio quality and bandwidth consumption of VoIP calls to which you apply

this

the Voice Codec Profile (in the Media Profiles List

Profile

). The codec choice

for codec will depend

depends on the interoperability requirements for connecting to other voice peers

, as well as on the

and bandwidth requirements. Most codecs use data compression algorithms, which saves

the

bandwidth

,

but

it

slightly reduces the voice quality

, whereas

. G.711 does not use compression and

therefore

requires

most bandwidth.

Note: The G.722.2 Codec only appears in the list box if the AMR license is installed.

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more bandwidth.

The following codecs are supported on 

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platform:

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  • G.711 A-Law
  • G.711 u-Law
  • G.722
  • G.722.2
  • G.723.1
  • G.726

...

  • G.729

...

  • Opus

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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  • 32 Kbps bit rate only.

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  • G.729: Supports G.729A and G.729AB

...

  • . The variant used when selecting

...

  • G.729

...

  • depends upon the setting of Media List flag

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  • Silence Suppression

...

  • . 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

to be

used by the codec.

This

setting

parameter applies to G.722.1, G.723.1

and

, G.726, and Opus codecs only.


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

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

, 50

, 60

. 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
use of
  • bandwidth. The larger the payload size, the fewer and larger the packets.
When
  • With larger payload sizes
are used
  • , fewer L2/Ethernet
headers as well as fewer
  • and IP/UDP/RTP headers are used
. The
  • ; a disadvantage is that if UDP packets get lost, the impact on the voice quality
will be much
  • is higher because a single packet contains more raw voice data.
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.

Only available when either

Applies to G722.2

and

, G.726

is the specified codec

, and Opus codecs only.

Payload Format

Specifies

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

codec is selected

only.

  • Bandwidth-Efficient Mode
  • Octet-Aligned Mode

...

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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