Overflow circuit

Sat Mar 27 08:13:10 UTC 2004

I have been doing VoIP over sat to northern Canada and Latin America for
more than five years now, using Cisco routers with analog and digital voice
ports, and also IP phones. Other than the inevitable lag due to 500+ ms RTT,
the voice quality with the G.729 codec has been good. I have lost count of
the number of mining operations in northern Canada that rely in VoIP over
sat for communication with the civilized world. Some of the bigger
operations have in excess of 500+ Cisco IP phones.

> -----Original Message-----
> From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On 
> Behalf Of Alexei Roudnev
> Sent: Friday, March 26, 2004 11:39 PM
> To: Patrick Murphy; Mailing List Subscriptions; nanog at merit.edu
> Subject: Re: Overflow circuit
> 
> 
> VoIP over satellite? I am very sceptical about it. Better, 
> forget such idea.
> 
> 
> 
> >
> > You may want to look at using H.323 gatekeepers with CAC (Call 
> > Admission Control).
> >
> > Here is a link to a Whitepaper on this Subject.
> >
> >
> http://www.cisco.com/en/US/partner/tech/tk652/tk701/technologi
> es_white_paper09186a00800da467.shtml
> >
> > Patrick
> >
> > ----- Original Message -----
> > From: "Mailing List Subscriptions" <jcc-list at thenetexpert.net>
> > To: <nanog at merit.edu>
> > Sent: Friday, March 26, 2004 7:54 PM
> > Subject: Overflow circuit
> >
> >
> > >
> > >
> > > I am looking for advice on technique or products that can 
> solve the 
> > > following challenge ...
> > >
> > > Two private line T1's between A and B - one terrestial T1 
> with >200 
> > > ms
> > RTT,
> > > the other T1 is over satellite with ~500 ms RTT. The circuits are 
> > > being
> > used
> > > for mixed VoIP (70%) and data (30%) applications. To 
> achieve optimal
> voice
> > > quality, we want to route all VoIP calls over the terrestial T1 
> > > until it
> > is
> > > "full", then divert all subsequent VoIP calls over the 
> satellite T1 
> > > (** while existing VoIP calls continue to be routed over 
> the terrestial T1).
> > >
> > > So it looks like I need per-flow (based on protocol, src 
> IP, dst IP, 
> > > src port, dst port) routing. It looks like MPLS Traffic 
> Engineering 
> > > can do
> the
> > > job. Is there anything else that can it with less complexity?
> > >
> > > Ideas or recommendations?
> > >
> > >
> > > Regards,
> > > Joe
> > >
> > >
> >
> 
> 
> 