[Asterisk-Dev] CVS HEAD (20040807) jitter buffer questions

Andrew Kohlsmith akohlsmith-asterisk at benshaw.com
Thu Aug 12 08:19:42 MST 2004


On Wednesday 11 August 2004 18:14, steve at daviesfam.org wrote:
>  1) Lag is not measured and will usually show 0ms.  Any other number is an
>     old measurement from the start of the call

Ok.

>  2) The jitter buffer on this machine is not used.  Any
>     jitter/jitterbuffer measurement shown is left over from the start of
>     the call.

Ok, so an "iax2 show channels" looking like this:
wu-ast*CLI> iax2 show channels
Peer             Username    ID (Lo/Rem)  Seq (Tx/Rx)  Lag      Jitter  JitBuf  
Format
192.168.2.2      benphone    16384/16384  00038/00035  00001ms  0640ms  0695ms  
GSM
66.225.202.72    benshaw     16385/00001  00032/00035  00075ms  0017ms  0079ms  
GSM
192.168.2.2      benphone    16387/16387  00142/00139  00006ms  0001ms  0051ms  
GSM
66.225.202.72    benshaw     16388/00184  00137/00140  00036ms  0021ms  0074ms  
GSM
192.168.2.2      benphone    16389/16386  00238/00248  00006ms  0000ms  0069ms  
GSM

with 640ms and 695ms jitter buffer for the first channel are just old 
numbers...  and since this machine is just bridging, then the lag, jitter and 
jitter buffer numbers are meaningless.

But for the calls coming in and out of the PRI on this box (i.e. not 
bridging), the lag, jitter and jitter buffer numbers are meaningful...  got 
it.

I'm definitely going to put a feature request in that if the call is bridged 
that the lag/jitter/jitbuf is perhaps replaced with the ID of the leg it's 
bridged with...   i.e. put something meaningful in there.  :-)

Thank you for your description of what's going on and how it's all working.  I 
really appreciate it.

Regards,
Andrew



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