[Freeswitch-users] Registration problem after attempting to install mod_opal and updating to latest git pull

[Anthony Minessale]

try latest GIT

On Fri, Feb 10, 2012 at 3:01 PM, Michael Collins <msc at freeswitch.org> wrote:
>
>
> On Fri, Feb 10, 2012 at 12:50 PM, Phil Quesinberry
> <philq at qsystemsengineering.com> wrote:
>>
>> Ok, here's part of the sip trace as requested.  I won't have time to
>> sanitize the whole thing until later but in the meantime, here's an
>> interesting excerpt that I wanted to make a few comments on:
>>
>> First, notice the "Unauthorized" response to the first registration
>> attempt but the next attempt is successful.  This has actually been going on
>> as long as I can remember with this particular provider.
>
>
> As far as the auth goes I believe it is required to have the registrar send
> out the 401 first because it contains a nonce that assists in keeping the
> communication relatively secure. If I could send a single REG and magically
> authenticate then that would make a SIP replay attack really easy.
>
> If I understand all this correctly, the registrar sending a 401
> "Unauthorized" does not mean, "Go away." Rather it means, "I'm not gonna let
> you in unless you give me the magic password. Here's a nonce to help you
> calculate the proper digest. I'm waiting for your next REGISTER message with
> the appropriate Authorization header."
>
> I'll have to defer to those more experienced than I on the rest of the post.
>
> -MC
>
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-- 
Anthony Minessale II

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