Subject: RE: [Sip] B2BUA

From: "Mary Barnes" <[email-masked]>
Date: Thu, 5 Dec 2002 08:39:03 -0600

Hi Rainer,

Henry was referring to was the fact that SIP calls were able to be made on
the Internet when the phone system in the NYC area was not available for use
by Columbia University, per the following thread:
http://www1.ietf.org/mail-archive/working-groups/sip/current/msg01026.html

Mary.

-----Original Message-----
From: Liebhart Rainer [mailto:[email-masked]]
Sent: Thursday, December 05, 2002 7:46 AM
To: 'Pete Cordell'; Henry Sinnreich
Cc: [email-masked]
Subject: AW: [Sip] B2BUA

Henry,

unfortunately you are comparing apples and pears when stating that the
telecom service failed for days after Sept 11, while Internet traffic
continued smoothly. The mentioned "telefon service" consists of thousands of
(real-time) calls to emergency centres while the Internet traffic consists
mainly of requests to the Web pages of CNN and others (with bad response
times) to retrieve *information* on the status of the catastrophe.

Rainer

-----Ursprüngliche Nachricht-----
Von: Pete Cordell [mailto:[email-masked]]
Gesendet: Donnerstag, 5. Dezember 2002 13:25
An: Henry Sinnreich
Cc: [email-masked]
Betreff: Re: [Sip] B2BUA

Henry,

The Internet has had a few famous outages as well.  Besides, if all the
telco traffic was put over IP, with today's level of QoS on the Internet, it
would have been brought to its knees also.

To say that one is all goodness and light and the other all evil doesn't do
us as a community any good as when customers find out there are problems
they tend not to believe anything else we say!

Only vapourware is flawless.  Most people know that.  Respect the
intelligence of your customer, or they will find somebody that does!!!

Pete.

----- Original Message -----
From: "Henry Sinnreich" <[email-masked]>
To: "'Phil Reynolds'" <[email-masked]>; <[email-masked]>
Sent: 04 December 2002 19:02
Subject: RE: [Sip] B2BUA

> >The telecoms people are clever enough to have thought
> >about that and build redundancy, fault tolerance and failover into
> their switches.
>
> This has proven unfortunately not to be the case on September 11 when
> telecom service failed for days, while Internet traffic continued
> smoothly. I suggest you to look at the central control model of the
> switch network versus the e2e architecture of the Internet. SIP enabled
> networks are also fully distributed and the e2e control principle
> maintained - that's why state in placed in SIP endpoints.
>
> I am not sure if a few words here can give full justice to the superior
> resilience of the Internet and to SIP enabled services,...
>
> Thanks, Henry
>
> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On Behalf Of Phil
> Reynolds
> Sent: Wednesday, December 04, 2002 7:37 AM
> To: [email-masked]
> Subject: RE: [Sip] B2BUA
>
>
> If a telephone switch crashes you loose all calls...  The telecoms
> people are clever enough to have thought about that and build
> redundancy, fault tolerance and failover into their switches.
> Maybe some of us IP-telecoms people have thought of similar techniques
> for SIP intermediaries?
> -----Original Message-----
> From: Jiri Kuthan [mailto:[email-masked]]
> Sent: 04 December 2002 12:32
> To: Christian Huitema; Roy, Radhika R, ALASO; [email-masked]
>
> Cc: [email-masked]; [email-masked];
> [email-masked]
> Subject: RE: [Sip] B2BUA
> [...snip...]
> I think there are more issues with B2BUA. A B2BUA's failure affects all
> current calls :-(
> -Jiri
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_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [email-masked] for questions on current sip
Use [email-masked] for new developments on the application of sip
_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [email-masked] for questions on current sip
Use [email-masked] for new developments on the application of sip