asterisk users - Aug 2004 - PLC (Packet loss cancel) questions

Hello

I've been using VoIP over a not so reliable net: I usually
get a 5% to 10% packet loss and a very high jitter. I tried
several codecs and parameters, and the only thing left to
test is PLC (Packet Loss Cancellement).

Have the astesrisk and digium people implemented PLC?, Are
they implmementing it now? and, if not, Where can i find an
implementation?

Thanks in advance

-- 
Jorge Verastegui G <jorge@redcetus.com>
RedCetus S.R.L.

Jorge Verastegui G [jorge@redcetus.com] wrote:
> I've been using VoIP over a not so reliable net: I usually
> get a 5% to 10% packet loss and a very high jitter. I tried
> several codecs and parameters, and the only thing left to
> test is PLC (Packet Loss Cancellement).
> 
There is no packet loss concealment in Asterisk at this time.

-- 
   _/   _/  _/_/_/_/  _/    _/  _/_/_/  _/    _/
  _/_/_/   _/_/      _/    _/    _/    _/_/  _/   K e v i n   W a l s h
 _/ _/    _/          _/ _/     _/    _/  _/_/    kevin@cursor.biz
_/   _/  _/_/_/_/      _/    _/_/_/  _/    _/

On 27 Aug 2004 at 2:33, Kevin Walsh wrote:
> Jorge Verastegui G [jorge@redcetus.com] wrote:
> > I've been using VoIP over a not so reliable net: I usually
> > get a 5% to 10% packet loss and a very high jitter. I tried
> > several codecs and parameters, and the only thing left to
> > test is PLC (Packet Loss Cancellement).
> > 
> There is no packet loss concealment in Asterisk at this time.
> 
Why doesn't asterisk clock to the 1000 interrupts per second instead 
of the incoming audio?  Were there no interrupts available when it 
started?  Even if you had no card you could use the ztdummy module 
and even though that might be off by a bit, surely it'd sound better 
than a connection which is experiencing packet loss?

How much work would be required to change this?  I guess it couldn't 
really be an option because of the totally different structure...

Would it be possible for one person to make those changes or would it 
require the authors of all modules to recode?

Matt Riddell

(www.sineapps.com)

On Thu, 26 Aug 2004, Jorge Verastegui G wrote:
> Have the astesrisk and digium people implemented PLC?
No
> Are
> they implmementing it now?
I want to but just haven't got to it yet.

Steve

> I have been reading the RFCs and I'm a bit more familiar with how it
works
> now although the algorithms are a bit over my head. I am somewhat new to
> RTP/VoIP, but I have a strong telecom/networking background so it makes
> things a bit easier to understand since they share a lot of common
> features.. I just thought from the post mentioning only IAX2 and "some
of
> the other codecs" that SIP et. al. would be ignored...
OOPS I meant...

* protocols" that SIP et. al. would be ignored...