RE: More on Vonage service disruptions...
Ah, and therein lies the rub. Any sort of QoS frob that is implemented for VoIP (or any other traffic for that matter) _must_ be truly honored end-to-end, and at every intermediate hop in between, for it to be "guaranteed" -- otherwise when traffic that you may designate as "higher quality" is handed off to another administrative domain that does not honor your traffic classifications, all bets are off. If you do not "own" the end-to-end network infrastructure, there is no way to guarantee any preferential handling of any particular subset of traffic. - ferg (who has been down this QoS road a few times before) -- Jeff Rosowski <rosowskij@ie.ymp.gov> wrote:
A question to ponder - what would happen to your network , from both a technical and financial perspective if all of your customers circuit switched voice traffic suddenly became ip?
Offer a "Quality of Service" product to enhance voice over IP services. -- "Fergie", a.k.a. Paul Ferguson Engineering Architecture for the Internet fergdawg@netzero.net or fergdawg@sbcglobal.net
On Wed, 2 Mar 2005, Fergie (Paul Ferguson) wrote:
Ah, and therein lies the rub.
Any sort of QoS frob that is implemented for VoIP (or any other traffic for that matter) _must_ be truly honored end-to-end, and at every intermediate hop in between, for it to be "guaranteed" -- otherwise when traffic that you may designate as "higher quality" is handed off to another administrative domain that does not honor your traffic classifications, all bets are off.
If you do not "own" the end-to-end network infrastructure, there is no way to guarantee any preferential handling of any particular subset of traffic.
So, set your Rate-Limiting of SIP traffic to 1 packet per second for the network that YOU control and then offer your VoIP subscribers a different QOS profile at a higher cost. Bingo, problem solved. The economy will work itself out. -- Vice President of N2Net, a New Age Consulting Service, Inc. Company http://www.n2net.net Where everything clicks into place! KP-216-121-ST
On Wed, 2 Mar 2005 22:15:48 -0500 (EST), Greg Boehnlein wrote:
So, set your Rate-Limiting of SIP traffic to 1 packet per second for the network that YOU control and then offer your VoIP subscribers a different QOS profile at a higher cost.
Bingo, problem solved. The economy will work itself out.
In fact this just happened to me here in Bangkok; I was doing some tests of streaming audio during which I was moved administratively from one ADSL domain to another. Streaming audio became unuseable with many packet discards apparently due to jitter running up to a second. (The utility at <http://testyourvoip.com> proved invaluable: it uses Java to install a simulated VoIP client and runs a broad suite of tests.) Behind-the-scenes discussions have revealed the provider's experience that a short time after it brought the service online, its bandwidth was overwhelmed by a small minority of users downloading videos etc. The solution was silently to throttle the throughput. (Same operator nightmare experienced at many institutions of "higher" education where the "students" use the ethernet jack in their dormrooms, intended for research purposes, to download sex videos.) Jeffrey Race -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.5.7 - Release Date: 3/1/2005
If you do not "own" the end-to-end network infrastructure, there is no way to guarantee any preferential handling of any particular subset of traffic.
There is a way to guarantee end-to-end QoS even if you don't own all networks along the way. That is for a 3rd party organization to impose a contractual requirement. Aside from the very common scenario where a large customer contracts with 2 ISPs, there are some 3rd parties which require such QoS in order to "certify" an ISP. In Europe, the automotive industry does this. Maybe the ANX does similar? Maybe one of the ANX certified service providers could do a talk about their experiences? If a group of ISP's want to create a trade association for end-to-end QoS guarantees, they are free to do this. Perhaps the shift to VoIP will even make this economically viable. In any case, this issue should make for an interesting panel discussion if NANOG does a VoIP track/theme. --Michael Dillon
participants (4)
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Fergie (Paul Ferguson) -
Greg Boehnlein -
Jeffrey Race -
Michael.Dillon＠radianz.com