G729 Codec Help

[ChrisLab]

Hi All,

I can't get G729 codec to work.
It seems like my G729 entry in "global_codec_prefs" and "outbound_codec_prefs" are being ignored.

fs_cli -x "show codecs" b | grep g729 gives
codec,G.729,mod_bcg729.

When I make a call I get:

2024-01-23 10:28:09.354570 97.90% [DEBUG] switch_core_media.c:5526 Audio Codec Compare [G729:18:8000:20:8000:1]/[G722:9:8000:20:64000:1]
2024-01-23 10:28:09.354570 97.90% [DEBUG] switch_core_media.c:5526 Audio Codec Compare [G729:18:8000:20:8000:1]/[PCMU:0:8000:20:64000:1]
2024-01-23 10:28:09.354570 97.90% [DEBUG] switch_core_media.c:5526 Audio Codec Compare [G729:18:8000:20:8000:1]/[PCMA:8:8000:20:64000:1]

When I do sofia status profile internal, I get:

CODECS IN G7221@32000h,G7221@16000h,G722,PCMU,PCMA
CODECS OUT G7221@32000h,G7221@16000h,G722,PCMU,PCMA

Under switch varibles i've got:

	global_codec_prefs	G729,G7221@32000h,G7221@16000h,G722,PCMU,PCMA		True
	outbound_codec_prefs	G729,PCMU,PCMA		True

Anybody have an idea whats happening here?
Thanks!

 

[Adrian Fretwell]

Hi,
Have a look at "inbound-codec-negotiation" in your SIP Profiles. I think that by default it is set to "generous" which means FreeSWITCH will try to accommodate the coded priorities requested by the endpoint. I always set it to "greedy", that way it is more likely that the negotiation will result in the codec(s) that I want to see being used.

A couple of other points:
1. If you use UDP, then keep the number of codecs you offer to a minimum, otherwise the extra data in the SDP body can cause the packet to exceed your MTU.
2. Try to organise your codecs so you avoid transcoding. Transcoding can put a heavy load on your CPU.

You may find the FreeSWITCH documentation on codec negotiation helpful:
https://developer.signalwire.com/fr...d/Codecs-and-Media/Codec-Negotiation_2883752/

 

[ChrisLab]

I ended up redoing the work of getting mod_bcg729 loaded etc..

I think my main problem wat that
status profile internal, didn't show G729 anywhere, but it showed under variables page that it was added.

CODECS IN G7221@32000h,G7221@16000h,G722,PCMU,PCMA
CODECS OUT G7221@32000h,G7221@16000h,G722,PCMU,PCMA

The above now shows G729 included, and the default mod_g729 is disabled/and not running.
I also set the inbound-codec-negotiation to greedy on both profiles.

Thank you for the information provided above!!
I'll look into points 1 & 2.


Thank you!!

 

[Adrian Fretwell]

If the codecs listed in 'sofia status profile internal' don't match what you have in variables, check that your profile settings are using
$${outbound_codec_prefs} and $${global_codec_prefs}
If they are try reloading the SIP profiles.

You may need to restart freeswitch if the $${} variables are not getting pre-processed.

I have always set my codecs in each SIP profile rather than using the $${} variables.

 

[ChrisLab]

Ok, ok, I'm with you.

Thanks again for your help!

 

[vuthy09]