As with many applications using UDP as a transport, most UDP-based application-layer VPN schemes (such as OpenVPN) do have some sort of rudimentary backward acknowledgment and reliability layers implemented on top of UDP. They're just a lot more lightweight, primitive, and generally much faster and less exacting than TCP.
Frank Bulk wrote: > Resending is not a waste if the re-transmitted packet can arrive within the > jitter buffer window. Practically speaking, though, since UDP packets are > generally not retransmitted (unless it's within some kind of TCP-based > tunnel), it's a moot point. > > Frank > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Hans Witvliet > Sent: Saturday, September 26, 2009 6:06 PM > To: [email protected] > Subject: Re: [asterisk-users] New thread - SIP over VPN > > <snip> > > Re-sending audio packets is waste of resource, > Better to have an audio-stream with an occasional missing packet, than > the delay of waiting for re-transmission and re-ordering. > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2009 - October 13 - 15 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2009 - October 13 - 15 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
