# Confused About Codecs

**URL:** <https://community.asterisk.org/t/confused-about-codecs/83782>\
**Category:** Asterisk Support\
**Created:** [April 25, 2020, 5:38pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782 "2020-04-25T17:38:22Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![threehappypenguins](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/threehappypenguins/32/4384_2.png) [@threehappypenguins](https://community.asterisk.org/u/threehappypenguins)\
**Post date:** [April 25, 2020, 5:38pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782/1 "2020-04-25T17:38:22Z")

</div>

I have an Odroid HC2 (odroidxu4; armv7l) and I have my sip registered, but I’m getting this error when I try to call from another phone (not part of asterisk):

`[Apr 25 12:57:00] NOTICE[27691][C-00000001]: chan_sip.c:10798 process_sdp: No compatible codecs, not accepting this offer!`

I think it’s because I don’t have g729 codec installed maybe? But when I type in `ffmpeg -codecs`, it shows `D.A.L. g729 G.729` in the list. I’m unsure if that’s relevant and whether that means I have g729 installed, because I read other stuff online saying that I have to compile g729 for arm chips. [I tried following these instructions](https://www.adeleda.com/compiling-g729-codecs-for-arm-on-raspberry-pi-b-with-bcg729-en.html), but got stuck on when I type make under Compile g279 codecs, I get the error (eventually): `codec_g72x.c:21:30: fatal error: asterisk.h: No such file or directory`. So I scrapped that idea.

Here is what I have in sip.conf (minus my username and password). Freephoneline.ca said for “used preferred codec” is G711u/PCMU or G729a. Sorry if my sip.conf looks wrong. I tried to keep the defaults what was originally in sip.conf, [plus what this person said they did](https://community.freepbx.org/t/trunk-settings-for-freephoneline-ca-fongo-ca/22479/15) for freephoneline.ca:

```auto
[general]
context=public
allowoverlap=no
udpbindaddr=0.0.0.0
tcpenable=no
tcpbindaddr=0.0.0.0
transport=udp
srvlookup=yes

register => 15555555555:password@voip.freephoneline.ca/15555555555

context=from-trunk
host=voip.freephoneline.ca
username=15555555555
secret=password
type=friend
insecure=port,invite
dtmfmode=auto
disallow=all
allow=ulaw&g729
fromdomain=freephoneline.ca

secret=[password]
type=user
context=from-trunk
insecure=port,invite
fromdomain=freephoneline.ca

registertimeout=3600
registerexpiry=3600

[basic-options](!)
	dtmfmode=rfc2833
	context=from-office
	type=friend

[natted-phone](!,basic-options)
	directmedia=no
	host=dynamic

[public-phone](!,basic-options)
	directmedia=yes

[my-codecs](!)
	disallow=all
	allow=ilbc
	allow=g729
	allow=gsm
	allow=g723
	allow=ulaw

[ulaw-phone](!)
	disallow=all
	allow=ulaw

```

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<div class="post-metadata">

**Author:** ![ambiorixg12](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/ambiorixg12/32/1887_2.png) [@ambiorixg12](https://community.asterisk.org/u/ambiorixg12)\
**Post date:** [April 25, 2020, 7:45pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782/2 "2020-04-25T19:45:51Z")

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_ **core show translation** _ and use one of those codec on that list , that the other party also support

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<div class="post-metadata">

**Author:** ![threehappypenguins](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/threehappypenguins/32/4384_2.png) [@threehappypenguins](https://community.asterisk.org/u/threehappypenguins)\
**Post date:** [April 25, 2020, 8:13pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782/3 "2020-04-25T20:13:48Z")

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The problem is fixed. It was my sip.conf file that needed fixing. Someone fixed it for me and this is what it looks like now. Thanks:

```auto
[general]
context=public
allowoverlap=no
udpbindaddr=0.0.0.0
tcpenable=no
tcpbindaddr=0.0.0.0
transport=udp
srvlookup=yes

register => 15555555555:password@voip.freephoneline.ca/15555555555

[freephoneline]
context=from-trunk
host=voip.freephoneline.ca
username=15555555555
secret=password
type=friend
insecure=port,invite
dtmfmode=auto
disallow=all
allow=ulaw
fromdomain=freephoneline.ca
secret=[password]
type=user
context=from-trunk
insecure=port,invite
fromdomain=freephoneline.ca

[basic-options](!)
    dtmfmode=rfc2833
    context=from-office
    type=friend

[natted-phone](!,basic-options)
    directmedia=no
    host=dynamic

[public-phone](!,basic-options)
    directmedia=yes

[my-codecs](!)
    disallow=all

```

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<div class="post-metadata">

**Author:** ![ambiorixg12](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/ambiorixg12/32/1887_2.png) [@ambiorixg12](https://community.asterisk.org/u/ambiorixg12)\
**Post date:** [April 25, 2020, 8:15pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782/4 "2020-04-25T20:15:18Z")

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> [@threehappypenguins](#):
>
> allow=ulaw

you removed g729, simle like that

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<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:** [May 25, 2020, 8:15pm UTC](https://community.asterisk.org/t/confused-about-codecs/83782/5 "2020-05-25T20:15:29Z")

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Closed on May 25, 2020, 8:15pm UTC

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