Transcoding even after pass-thru settings

Asterisk Asterisk Support
1

Hi guys, I’ve an asterisk server that the load averages are crazy high with only 350 calls.
The LA is around 80-100, no other process run on this server, I’m pretty sure that the problem is the transcoding.

What happen is I have a trunk setup and it accepts only g729, I’ve g729 installed into asterisk too

I tried with ulaw too, same thing happens.

[trunk2]
host=xxx.xxx.xxx.xxx
outboundproxy=xxx.xxx.xxx.xxx
type=peer
disallow=all
allow=g729
;allow=ulaw

what should i do? is there a way to make sure that asterisk is in fact transcoding it?

Tks!

2

On the Asterisk CLI find the channel you are interested in using:

core show channels

Then use it to get more information about the channel by executing:

core show channel

You can then see what read/write formats the channel is using and whether or not it is transcoding. For instance, are “WriteTranscode” and/or “ReadTranscode” blank or have values.

For example, you might see something similar to the following:

NativeFormats: (ulaw)
WriteFormat: slin48
ReadFormat: slin48
WriteTranscode: Yes (slin@48000)->(slin@8000)->(ulaw@8000)
ReadTranscode: Yes (ulaw@8000)->(slin@8000)->(slin@48000)
1 Like
3

Thank you, and I’m wrong I think… I have no idea what is causing the load average then llook:

State: Up (6)
NativeFormats: (g729)
WriteFormat: g729
ReadFormat: g729
WriteTranscode: No
ReadTranscode: No

Do you have any idea?

4

You can tell if it is transcoding by looking at the licence use counts for the codec.

Lots of things will force the conversion to signed linear format, e.g,: inband DTMF, call recording, conferences, generated tones, Originate/call files if you don’t specify a codec.