Codecs

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Codecs are used to convert analog to digital voice signals and vice versa. These options set preferred codecs used by the extension.

 

NOTE: If some of the codecs are disabled (cannot be selected), navigate to 'Settings: Servers: Edit: Default Codecs' and enable them under the 'Local' group

 

 

codecs

 

 

 

 

Disallow:

 

This field is very unique indeed. In order to work properly, this option must always be set to 'disallow all'

 

 

 

Allow:

 

Codecs UAD/Phone is allowed to use

 

Example: Codecs vary in the sound quality/bandwidth they use (see bellow for more info). Select a box next to a codec name to allow UAD/Phone to use that codec

Field Type: Check box

 

 

 

Codec bandwidth usage:

 

•ITU G.711 ulaw        - 64 Kbps, sample-based, used in US
•ITU G.711 alaw        - 64 Kbps, sample-based, used in Europe
•ITU G.723.1                    - (5.3/6.3 Kbps, 30ms frame size
•ITU G.726                    - 16/24/32/40 Kbps
•ITU G.729                    - 8 Kbps, 10ms frame size
•GSM                                - 13 Kbps (full rate), 20ms frame size
•iLBC                            - 15Kbps,20ms frame size: 13.3 Kbps, 30ms frame size
•Speex                - 2.15 to 44.2 Kbps
•LPC10                - 2.5 Kbps
•H.261 Video        - Used over ISDN lines with resolution of 352x288
•H.263 Video        - Low-bit rate encoding solution for video conferencing
•H.263+ Video        - Extension of H.263 that provides additional features that improve compression over packet switched networks.