Install Ilbc Codec Asterisk

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Install Ilbc Codec Asterisk Windows 7

Sep 06, 2011 Sad. I don't know what that means for the licensing of the codec. I know that the new WebRTC iLBC codec is vastly different from the older one.

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Asterisk supports a variety of audio and video media. Asterisk provides CODEC modules to facilitate encoding and decoding of audio streams. Additionally file format modules are provided to handle writing to and reading from the file-system.

The tables on this page describe what capabilities Asterisk supports and specific details for each format.

Enabling specific media support
- Channel driver configuration
Audio Support

There are three basic requirements for making use of specific audio or video media with Asterisk.

The Asterisk core must support the format or a module may be required to add the support.
Asterisk configuration must be modified appropriately.
The devices interfacing with Asterisk must support the format and be configured to use it.

Module compilation and loading

For audio or video capabilities that require a module - you should make sure that the module is built and installed on the system.

See the section on Using Menuselect to Select Asterisk Options if you need help figuring out how to get a module built and then section on Configuring the Asterisk Module Loader to verify that a module gets loaded when Asterisk starts up.

Channel driver configuration

Audio or video capabilities for Asterisk are used on a per channel or per feature basis. To tell Asterisk what CODECs or formats to use in a particular scenario you may need to configure your channel driver, or modify configuration for the feature itself.

We'll provide two examples, but you should look at the documentation for the channel driver or feature to better understand how to configure media in that context.

Configuring allowed media for a PJSIP endpoint

We set the option 'allow' to a string of values '!all,ulaw'.

Install Ilbc Codec Asterisk Windows 7

The value '!all' means 'Disallow all' and is identical to 'disallow=all'. This tells Asterisk to disallow all codecs except what we further define in the allow option.
The value 'ulaw' instructs Asterisk to allow ulaw audio during media negotiation for this endpoint.

See the section Configuring res_pjsip for more information on the PJSIP channel driver.

Configuring app_voicemail file formats for recordings

In the general section of voicemail.conf you can set the formats used when writing voicemail to the file-system. We set the option 'format' to a string of file format names.

The value 'wav49' represents GSM in a WAV wav49 container.
The value 'wav' represents SLIN in a wav container.
The value 'gsm' represents GSM in straight gsm format.

Endpoint device configuration

Configuring your particular device is outside the scope of the Asterisk documentation.

Consult your devices user/admin manual to find out where you define codecs or media to be used.

For VoIP desk phones there are typically two places to look for media configuration.

The web GUI for the phone.
The provisioning files that are pulled down by the phones on your network.

A variety of audio capabilities are supported by Asterisk.

Name	Config Value	Capability: (T)ranscoding (P)assthrough	CODEC Module	Format Module	Distributed w/ Asterisk?	Commercial License Required?
ADPCM	adpcm	T	codec_adpcm	format_vox	YES	NO
G.711 A-law	alaw	T	codec_alaw	format_pcm	YES	NO
G.711 µ-law	ulaw	T	codec_ulaw	format_pcm	YES	NO
G.719	g719	P	n/a	format_g719	YES	NO
G.722	g722	T	codec_g722	format_pcm	YES	NO
G.722.1 Siren7	siren7	T	codec_siren7	format_siren7	Codec(NO) Format(YES)	NO
G.722.1C Siren14	siren14	T	codec_siren14	format_siren14	Codec(NO) Format(YES)	NO
G.723.1	g723	T	codec_g723	format_g723	Codec(NO) Format(YES)	YES(hardware required)
G.726	g726	T	codec_g726	format_g726	YES	NO
G.726 AAL2	g726aal2	T	codec_g726	format_g726	YES	NO
G.729A	g729	T	codec_g729a	format_g729	Codec(NO) Format(YES)	YES
GSM	gsm	T	codec_gsm	format_gsm	YES	NO
ILBC	ilbc	T	codec_ilbc	format_ilbc	YES	NO
LPC-10	lpc10	T	codec_lpc10	n/a	YES	NO
SILK	silk	T	codec_silk	n/a	Codec(NO) Format(YES)	NO
Speex	speex	T	codec_speex	n/a	YES	NO
Signed Linear PCM	slin	T	codec_resample	format_sln	YES	NO
Ogg Vorbis	n/a	n/a	n/a	format_ogg_vorbis	Codec(NO) Format(YES)	NO
Opus	opus	T	codec_opus	n/a	Codec(NO) Format(YES)	NO
wav (SLIN)	wav	T	n/a	format_wav	YES	NO
WAV (GSM)	wav49	T	n/a	format_wav_gsm	YES	NO

Speex Support

Asterisk supports 8, 16, and 32kHz Speex. Use of the 32kHz Speex mode is, like the other modes, controlled in the respective channel driver's configuration file, e.g. chan_sip's sip.conf or PJSIP's pjsip.conf.

Signed Linear PCM

Asterisk can resample between several different sampling rates and can read/write raw 16-bit signed linear audio files from/to disk. The complete list of supported sampling rates and file format is found in the expansion link below:

Asterisk File format
8kHz	.sln
12kHz	.sln12
16kHz	.sln16
24kHz	.sln24
32kHz	.sln32
44.1kHz	.sln44
48kHz	.sln48
96kHz	.sln96
192kHz	.sln192

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Users can create 16-bit Signed Linear files of varying sampling rates from WAV files using the sox command-line audio utility.

In this example, an input WAV file has been converted to Signed Linear at a depth of 16-bits and at a rate of 32kHz. The resulting output.sln file is then renamed output.sln32 so that it can be processed correctly by Asterisk.

You'll notice the CODEC module column is missing. Video transcoding or image transcoding is not currently supported.

Name	Config Value	Capability: (T)ranscoding (P)assthrough	Format Module	Distributed w/ Asterisk
JPEG	jpeg	P	format_jpeg	YES
H.261	h261	P	n/a	YES
H.263	h263	P	format_h263	YES
H.263+	h263p	P	format_h263	YES
H.264	h264	P	format_h264	YES
VP8	vp8	P	n/a	YES
VP9	vp9	P	n/a	YES