-----Messaggio originale----- Da: Steve Wright [mailto:paua@quicksilver.net.nz] Inviato: venerdì 5 settembre 2003 11.31 A: Andreani Luca Oggetto: Re: [LARTC] time window in CBQ On Fri, 2003-09-05 at 19:22, Andreani Luca wrote:> Dear list, > > I have two linux boxes acting as VoIP Gateway in the following > configuration: > > > IP Phone ----------+ > +------------------+ > +------------------+ +---------------- IP Phone > > |-----------eth0-| Linux BOX1 > |-hdlc0----------hdlc0-| Linux BOX2 |-hdlc0-----------| > PC ----------------- -+ > +------------------+ > +-----------------+ +--------------- PC > > The hdlc link is 64 kbps.is 64kbit/sec enough for VoIP ? I would have thought not.. but I do not have VoIP... /steve
On Fri, 2003-09-05 at 21:54, Andreani Luca wrote:> with codec G.729 the bandidth is 8kbps, plus the overhead it reachs > about 27 kbps. I can make two calls on that link, and I made it...thanks for that. I am surprised. /steve _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
On Fri, 5 Sep 2003, Andreani Luca wrote:> is 64kbit/sec enough for VoIP ? I would have thought not.. but I do not > have VoIP...Steve, what voip codec do you use? If you can select, use G723 (6.3 kbit/s)> > > /steve > >--- Catalin(ux) BOIE catab@deuroconsult.ro _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Hi Steve,> > is 64kbit/sec enough for VoIP ? I would have thought not.. but I do not > > have VoIP... > > Steve, what voip codec do you use? > If you can select, use G723 (6.3 kbit/s)yep, 64kBit is fine with GnomeMeeting. You should use Speex8k though, as there''s a huge protocol overhead that needs to be added to that number of x.y kBit/s.. (many small packets) Empirically Speex8k works fine and MS-GSM might also do. The G.723 does require a hardware extension and is not available with pure software. Feel free to search the GnomeMeeting archives for details on configurations. ;) -- Best regards, Kilian
On Fri, 2003-09-05 at 22:03, Catalin BOIE wrote:> On Fri, 5 Sep 2003, Andreani Luca wrote: > > > is 64kbit/sec enough for VoIP ? I would have thought not.. but I do not > > have VoIP... > > Steve, what voip codec do you use? > If you can select, use G723 (6.3 kbit/s)ahh, but I do not have VoIP. I am planning still. /sw _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
I must recommend against using G723 unless you are in a very bandwidth starved but high reliability situation. VOIP is extremely time sensitive, and the latency involved in compression greatly reduces your margin for error. G711 uses more bandwidth (64k per call is a reasonable figure, but it depends on packetization), but will be considerably more forgiving to jitter. On Friday 05 September 2003 05:03 am, Catalin BOIE wrote:> On Fri, 5 Sep 2003, Andreani Luca wrote: > > is 64kbit/sec enough for VoIP ? I would have thought not.. but I do not > > have VoIP... > > Steve, what voip codec do you use? > If you can select, use G723 (6.3 kbit/s) > > > /steve > > --- > Catalin(ux) BOIE > catab@deuroconsult.ro > _______________________________________________ > LARTC mailing list / LARTC@mailman.ds9a.nl > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/_______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/