Replacing PBXes with Open Source
Kevin D. Clark
clark_k at pannaway.com
Wed Aug 25 17:10:01 EDT 2004
"Ken D'Ambrosio" <kend at xanoptix.com> writes:
> Not sure... after all, you need the Internet infrastructure -- with a
> fair bit of bandwidth -- in place to take advantage of it. I believe
> calls are ~80kb/s, including TCP overhead, which is a fair bit more
> than analog can cope with.
RTP nearly always gets transported over UDP. The current thinking is
that TCP's congestion control don't mesh very well for time critical
data.
(note: the signaling that occurs to setup a call is different than
the actual call itself -- these use different protocols)
> One question I have, though: how does H.323 cope with NAT, firewalls,
> etc., for incoming calls? Anyone know?
Or SIP for that matter... The answer is that some protocols handle
these, usually with a little bit of pain. A lot of people who work in
this space wish that IPv6 would get deployed a whole lot sooner.
Regards,
--kevin
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