Semi OT: communication between telco networks

Robert Brockway robert-5LEc/6Zm6xCUd8a0hrldnti2O/JbrIOy at
Wed Jul 1 06:44:42 UTC 2009

On Tue, 30 Jun 2009, Aviss,Tyler wrote:

> I've often heard of ISPs coming to an impasse with pairing agreements, and 
> ceasing to route traffic for each other (resulting in "dead zones" if IPs the 
> clients can't connect to).

A dead zone would constitute a misconfiguration or a transient failure.

BGP will find a 'shortest path' of Autonomous Systems between any two 
networks on the Internet.

IXPs are highly desirable but not essential.

> This isn't (a least not yet) a complaint about Bell/Fido/PC, but rather a 
> question of whether such things can or often do happen in phone-land. Maybe

The circuit switched global phone system continues to have a level of 
reliability the Internet can only dream of.

> they use VOIP and it doesn't recognize that extension, or some other 
> weirdness?

Quite a few times I've been unable to reach certain phone numbers using 
certain long distance carriers (or been unable to reach the long distance 
carriers from the local phone company) but these problems never occur with 
the old time Telcos (which suck in other ways).


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