On Apr 1, 2009, at 12:17 PM, Dan Wing wrote:
And I doubt that every VoIP SP will be meshed with every other VoIP
SP. So in
many situations there will be a transit SP or two along the path.
The PSTN
has transit service providers (my local phone company is not directly
connected with the phone company in Syria or India), and the
Internet has
transit service providers (some little ISP in Wyoming is not directly
connected with a little ISP in Switzerland).
But the transit ISP should be routing the packets using their source
and destination IP addresses, not mucking about in the application
protocol. If some backbone ISP started putting in transparent HTTP
proxies that diverted Web traffic to alternate sites, we'd have a
"peasants with torches" scenario.
Same for most of the media-steering cases: The traffic is IP. Route it
like IP traffic and stop pretending to be a circuit switched phone!
Doing application-sensitive packet routing is a direct path to chaos
and unmanageable operational complexity.
Or maybe we should have just defined SIP-over-MPLS and left out the
whole IP middle layer?
--
Dean
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