- Ilbc Codec Vs G729
- Asterisk Codecs
- Install Ilbc Codec Asterisk Westerville Ohio
- Install Ilbc Codec Asterisk Westerville Oh
- Install Ilbc Codec Asterisk Westerville Oh
- Install Ilbc Codec Asterisk Westerville Menu
The code produces a Asterisk modules, codec_g729.so and codec_g723.so. A good G.729 implementation uses less bandwidth and less CPU power than other low bit rate codecs such as iLBC. G.729 uses 8kbps, iLBC uses 13kbps. Notes about install Intel IPP libraries Arkadi's web site - binaries, mirror Legal Stuff - Important, please read. Add ilbc to Asterisk. Hi I am using Asterisk 1.4 and there is no iLBC on it.server is CentOS 4.5 Final. Then rerun the Asterisk install. Joel_Sisko Commented: 2008-05-30. Just in case you were not sure where to grab it, here is the code for the script. (cd codecs/ilbc && awk -f extract-cfile.awk rfc3951.txt) echo '***'.
I'm new to creating a voip apps for mobile devices. I currently have an asterisk server set up and also an iphone voip app and an android voip app. For both the iphone and android, I'm using linphone core library as my sip library.
Right now, I am able to successfully make calls. Sometimes I have call quality issues like 'crackling' in the audio, or parts of people's sentences are dropped. As such, I'm trying to improve performance.
This is my first time investigating codecs, so I'm trying to determine which codecs are actually in use. So my question is:
When are codecs actually employed? Do the phones use codecs to compress the audio to be uploaded and decompress the incoming audio? Or does something happen on the asterisk server? Or both?
I haven't been able to figure out the answer to this question. When I run the linphone command getAudioCodecs(), it gives me a list of available codecs, but not actually the one thats employed on a particular call. For example, here's a var_dump of the function getAudioCodecs() in the middle of a call:
That's a lot of codecs...so how do we know which one is being used?
As for my asterisk server, my sip.conf has the following lines for each user:
So does that mean I'm using GSM? Because GSM is the only codec that appears in both my var_dump of getAudioCodecs and my sip.conf?
Here's the documentation for the linphone sip library if it helps:http://www.linphone.org/docs/liblinphone-javadoc/
Ilbc Codec Vs G729
Additional Info
OK, I found a few more interesting things. I wrote this code into my android app:
I noticed that the variable mime currently holds the value 'PCMU'. I did a google search and i see it is associated with G.711.
So can I assume that on the android app, it is the G.711 Codec? If so, then how come even though I don't mention G711 in my sip.conf, it still allows it?
Asterisk Codecs
JohnJohn1 Answer
Codec on asterisk will be selected in following order
1) Check which codec your device allowed in INVITE
2) Check which codecs you have in peer OR in [general] section. Peer have priority, but if you have no disallow=all in peer section codecs from [general] section also can be used. [general] section codecs can be seen by:
Peers codecs can be seen by
3) Select first codec which match both section. Order as described in asterisk's config.
On outgoing it do similar selection, if not match do transcode. Unfortanly asterisk currently not try select codec supported by both peers, so higly recomended use same order of codec or even single codec to avoid transcoding(decrease quality+hi cpu usage)
G711a and alaw is SAME codec(just other name)G711u and ulaw is SAME codec.transcoding from alaw to ulaw is lossless and very simple, so no quality loss.
Currently asterisk not support asymetric codecs, so both way will be same codec. To got more info use
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Install Ilbc Codec Asterisk Westerville Ohio
I've successfully got the channel from phone->PBX working on G279. I'm just trying to get the PBX->trunk to also be G279.
I did this by using FreePBX and putting in allow=g729,ulaw into each extension. As I'm using FreePBX and no asterisk expert I wanted to avoid editing sip.conf if possible.
Install Ilbc Codec Asterisk Westerville Oh
The question is, how can get the same effect for the trunk?
2 Answers
I am assuming that you have g729 codec module at this point.
In your trunk configuration page, in PEER Details fields
add
disallow=all
Install Ilbc Codec Asterisk Westerville Oh
allow=g729
Install Ilbc Codec Asterisk Westerville Menu
Make sure you do it in the same sequence as above. Also do the same in USER Details if you have any entry in this field.
There is an easier way to do this now. Navigate the 'Asterisk SIP Settings' page and simply tick the codec. You can also use this page to change the priority of the authorized codecs...