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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Overflow circuit
>-----Original Message----- >From: Mailing List Subscriptions [mailto:[email protected]] >Sent: Saturday, March 27, 2004 08:13 AM >To: [email protected] >Subject: RE: Overflow circuit > > >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. > Alaska has a lot connections doing VoIP over Sat also. Most of the state is served by Sat connections, being the largest state in the U.S. Dee >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Alexei Roudnev >> Sent: Friday, March 26, 2004 11:39 PM >> To: Patrick Murphy; Mailing List Subscriptions; [email protected] >> 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" <[email protected]> >> > To: <[email protected]> >> > 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 >> > > >> > > >> > >> >> >> > > >
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