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    This discussion has been archived. No new comments can be posted.
    ICANN bosses slam VoIP regulation | Log in/Create an Account | Top | 19 comments | Search Discussion
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    VOIP is Different - Look at Local DSL Bypass
    by Anonymous on Saturday April 16 2005, @10:37PM (#14917)
    When you speak of IP addresses, you have to
    consider that VOIP is different. Forget about
    the end-to-end zealots for one moment. Look
    at the realities of the local loops and DSL.

    Telco DSL is now down to $18 per month to the ISP.
    The consumer obtains one routable public IP
    address. For the ISP, it is NOT desirable to
    have that address be globally routable. The ISP
    simply wants to use that address to VPN to the
    nearest COLO. The $18 is now like the T1 bit-pipe
    charge, with or without IP. It really does not
    matter that IP is running on that loop. The ISP
    just wants their CPE equipment to VPN over to
    the COLO. They then have the customer (virtually)
    inside of their network. One of the first things
    that they do in that COLO is convert the voice
    into audio streams into the PSTN. End-to-end
    VOIP is a myth. It does not scale. Engineers
    would be fools to tag every 8 byte packet of
    voice with the IP overhead. They optimize as
    soon as they can. That is the only way they can
    make voice cheap.

    Going back to that DSL local loop, once people
    see all of the VPN overlay going on, they will
    then optimize that. Most people do not realize
    that the DSL is already running ATM. On top of
    that, you have the PPPOE bandwidth pig. What the
    ISP wants is a clear bit pipe from the CPE to
    their COLO. ISPs use the current DSL as to get
    by, but in the future, they can lower the cost
    more (or increase the performance) by REMOVING
    the layers placed there doing the bootstrap
    phase of the deployments. Less is more.

    Keep in mind that the telco does not really want
    to facilitate the ISP. Dry pair alarm circuits
    would actually serve the ISP well. Those are not
    showcased by the telco. They are total bypass
    and push all the grunt-work to the telco and
    allow the ISP to skim all the cream. The telco
    does not want that. DSL is a compromise.

    Getting back to your IP address points, with the
    DSL only used to VPN from the ISP COLO to the
    CPE, the two addresses at each end do not have
    to be public addresses. The telco can use 10.*.*.*
    in a local area and if they run out, 11.*.*.*.

    The ISP COLOs then form the back-bone and they
    have plenty of routable address space, because
    they have routed around the ISOC (telco) regime.
    Contrary to what people think, ISPs are not in
    the ISOC love-fest camp. For years, ISPs were
    eschewed by the ISOC communists as commercial
    predators. The ISOC socialists expect everything
    to be free and provided by their academic campus.
    They are not living in the real world.
    [ Reply to This | Parent ]
    VOIP is Different - Look at Local DSL Bypass by Anonymous
    Re:VOIP is Different - Look at Local DSL Bypass
    by KarlAuerbach on Sunday April 17 2005, @08:16AM (#14920)
    User #3243 Info | http://www.cavebear.com/
    I'm not sure that I get your point.

    By-the-way. VOIP packets are generally on the order of about 200 bytes, not 8 bytes. But yes, you are right about DSL often running ATM and thus saddling voip with the ATM cell tax.
    [ Reply to This | Parent ]
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