R: [LARTC] time window in CBQ

R: [LARTC] time window in CBQ

[Andreani Luca]

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-----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


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Re: R: [LARTC] time window in CBQ

[Steve Wright]

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


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Re: R: [LARTC] time window in CBQ

[Catalin BOIE]

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
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Re: R: [LARTC] time window in CBQ

[Kilian Krause]

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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

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Re: R: [LARTC] time window in CBQ

[Steve Wright]

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


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Re: R: [LARTC] time window in CBQ

[John McCain]

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/

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