# Codec Translation Issues

**URL:** <https://community.asterisk.org/t/codec-translation-issues/37597>\
**Category:** Asterisk Support\
**Created:** [December 7, 2011, 9:10pm UTC](https://community.asterisk.org/t/codec-translation-issues/37597 "2011-12-07T21:10:01Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [December 7, 2011, 9:10pm UTC](https://community.asterisk.org/t/codec-translation-issues/37597/1 "2011-12-07T21:10:01Z")

</div>

I currently have two asterisk 1.6.2.2 machines that seem to give a strange output for core show traslation. One machine currently looks right and the only difference is that one is a centos vm on Intel® Xeon® CPU E5420 @ 2.50GHz, and the two that dont work are centos installs on Intel® Xeon® CPU E5420 @ 2.50GHz.

The two installs that are broken look like this:

Source Format (Rows) Destination Format (Columns)

```
       g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722 siren7 siren14 slin16
 g723 - - - - - - - - - - - - - - - -
  gsm - - - - - - - - - - - - - - - -
 ulaw - - - 1 - - 1 - - - - - - - - -
 alaw - - 1 - - - 2 - - - - - - - - -

```

g726aal2 - - - - - - - - - - - - - - - -  
adpcm - - - - - - - - - - - - - - - -  
slin - - 1 1 - - - - - - - - - - - -  
lpc10 - - - - - - - - - - - - - - - -  
g729 - - - - - - - - - - - - - - - -  
speex - - - - - - - - - - - - - - - -  
ilbc - - - - - - - - - - - - - - - -  
g726 - - - - - - - - - - - - - - - -  
g722 - - - - - - - - - - - - - - - -  
siren7 - - - - - - - - - - - - - - - -  
siren14 - - - - - - - - - - - - - - - -  
slin16 - - - - - - - - - - - - - - - -

The vm which looks right looks like this:

```
      Source Format (Rows) Destination Format (Columns)

       g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722 siren7 siren14 slin16
 g723 - - - - - - - - - - - - - - - -
  gsm - - 1001 1001 2000 1001 1000 2999 - - - 2000 2000 - - 3000
 ulaw - 1000 - 1 1001 2 1 2000 - - - 1001 1001 - - 2001
 alaw - 1000 1 - 1001 2 1 2000 - - - 1001 1001 - - 2001

```

g726aal2 - 1999 1001 1001 - 1001 1000 2999 - - - 2000 2000 - - 3000  
adpcm - 1000 2 2 1001 - 1 2000 - - - 1001 1001 - - 2001  
slin - 999 1 1 1000 1 - 1999 - - - 1000 1000 - - 2000  
lpc10 - 2999 2001 2001 3000 2001 2000 - - - - 3000 3000 - - 4000  
g729 - - - - - - - - - - - - - - - -  
speex - - - - - - - - - - - - - - - -  
ilbc - - - - - - - - - - - - - - - -  
g726 - 1998 1000 1000 1999 1000 999 2998 - - - - 1999 - - 2999  
g722 - 1999 1001 1001 2000 1001 1000 2999 - - - 2000 - - - 1000  
siren7 - - - - - - - - - - - - - - - -  
siren14 - - - - - - - - - - - - - - - -  
slin16 - 2999 2001 2001 3000 2001 2000 3999 - - - 3000 1000 - - -

Any thoughts would be greatly appreciated thanks.

---

<div class="post-metadata">

**Author:** ![david55](https://avatars.discourse-cdn.com/v4/letter/d/e19adc/32.png) [@david55](https://community.asterisk.org/u/david55)\
**Post date:** [December 7, 2011, 10:15pm UTC](https://community.asterisk.org/t/codec-translation-issues/37597/2 "2011-12-07T22:15:13Z")

</div>

Nothing obviously wrong. The first one only has the G.711 codec loaded.

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [December 8, 2011, 5:09pm UTC](https://community.asterisk.org/t/codec-translation-issues/37597/3 "2011-12-08T17:09:02Z")

</div>

Right. The thing is that they are both default installs and have the same codecs in the their /usr/lib/asterisk/modules directories. I cant find any config that controls which are loaded and all the instructions ive read just say to plop the codec in that directory and restart asterisk. What am i missing or where should i dig. Thanks.

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [December 9, 2011, 12:53am UTC](https://community.asterisk.org/t/codec-translation-issues/37597/4 "2011-12-09T00:53:40Z")

</div>

I’m back to report that i have found the issue. Our modules.conf looked like this:

[modules]  
autoload=no ; only load explicitely declared modules

;Codec  
load =\> codec\_alaw.so ; alaw codec for voice  
load =\> codec\_ulaw.so ; ulaw codec for voice  
load =\> codec\_a\_mu.so ; A-law and Mulaw derect Coder/Decoder. G711

autoload off and only two codecs loaded. I added the codecs i wanted to load and its fine. I thought that the configs were identical cause it was i that had synched them up. That slowed me down thinking i was already right about stuff. Never assume!