asterisk users - Oct 2005 - how do I know what codec is being used

Hi,
 This may be a stupid/easy question for many of you.
 Q. how do I know what codec is being used for a particular call or call
leg?
  Thanks.
AK
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First you can do a show channels at the CLI (some output columns removed 
for clarity):

pbx*CLI> show channels
Channel          ...  Application(Data)
Zap/1-1          ...  Bridged Call(SIP/112-c8e1)
SIP/112-c8e1     ...  Dial(Zap/1/7476011||TW)
2 active channels
1 active call

We can see the two call legs.  My SIP extension, 112, Dial()ed 7476011 
out Zap/1, and we can see that the Zap/1-1 channel is Bridged to my 
SIP/112.  That's the two legs of my call.  Since I really only care 
about codecs in relation to my sip leg, I would next type at the CLI:

pbx*CLI> show channel SIP/112-c8e1
(or pbx*CLI> show channel Zap/1-1, if I really wanted to see about the 
Zap leg)

Among lots of other cool info, the output will contain what you need:

...
    NativeFormat: 4
     WriteFormat: 4
      ReadFormat: 4
...

finally, by typing 'show codecs' at the CLI:

...
     4 (1 <<  2)      (0x4)  audio    ulaw   (G.711 u-law)
...

we see that codec 4 is ulaw.  You could of course also do a:

sip show peer 112 (or other extension) to see what they have registered 
with asterisk claiming to support:

...
   Codecs       : 0x104 (ulaw|g729)
   Codec Order  : (g729,ulaw)
...

Moj




Andy Kuo wrote:
> Hi,
>  
> This may be a stupid/easy question for many of you.
>  
> Q. how do I know what codec is being used for a particular call or call
leg?
>  
>  
> Thanks.
> AK
>  
>  
> 
> 
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-- 
Mojo <mojo@horanappraisals.com>
Office Manger, Horan & Company, LLC
(907) 747-6666 x112

Or...

*CLI> sip show channels
Peer             User/ANR    Call ID      Seq (Tx/Rx)   Format  Duration
1.2.3.4          luki1       32f5bea-2c0  00101/00102   ulaw    0:14
1 active SIP channel(s)