[Asterisk-Dev] Increasing reliability on lossy connections

[Steve Totaro]

> On Wed, Jan 12, 2005 at 02:07:31PM -0500, John Todd wrote:
> > At 12:54 PM -0600 1/12/05, Michael Giagnocavo wrote:
> > >
> > >So, what I was thinking is that if duplicate IAX2 packets were sent,
then
> > >most packets would get there, at least once. IAX2 would discard the
> > >duplicates, and things would work better, at double the bandwidth. I
was
> > >thinking about adding an iax.conf option to configure this per user.
> >
> > The better solution would be to implement iLBC's packet concealment
> > methods, and then use that codec for your IAX2 trunking.  I am
> > currently under the impression (someone correct me if I'm wrong!
> > It's been a while since this was discussed...) that the iLBC code in
> > * is not completely implemented due to timing issues, so that iLBC's
> > great packet concealment methods are unused.
> >
> > Sending packets twice is... a frightening hack.
>
> Actually  it's a small form of the PCR error correction method used on
> satellite links.  Preventive Cyclic Retransmission periodically resends
> unacknowledged PDUs until they are ack'd.
>
> -- 
> Mike

Same for connection oriented protocols and TCP.