Subject: Re: [Sipping] Comments on tel:uri

From: "Bob Hughes" <[email-masked]>
Date: Wed, 16 Oct 2002 10:14:09 -0400

Sorry for the late response to the suggestion that an IBMer speak up on
this.

Yes, the discussion of what happens inside IBM  is basically correct.  The
"tie-line" designation is a hold over from years ago from a time when IBM
(like other large companies) did have networks of dedicated voice circuits.
"Tie Line" now represents our internal dial plan now using a carrier voice
VPN for transport.  IBM tie line numbers are not directly dialable from
outside IBM.

Sorry for any confusion.

Program Manager, VoIP and Voice/Data Convergence
BT/CIO Technology Deployment
914-747-4351:  TL 320-8618

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                      f.org                    Subject:  Re: [Sipping] Comments on tel:uri                 

                      10/15/2002 07:28                                                                     
                      AM                                                                                   

In a message dated 10/14/2002 9:34:17 AM Eastern Daylight Time,
[email-masked] writes:

 >
 > In the 3rd example, it is unknown what the phrase "IBM tie line
 > numbering system" refers to. In fact, the example seems to be one of a
 > private network with its own internal numbering system which is
 > different from the "public" E.164 numbering, although the extension
 > numbers (final 4 digits) are often the same. It is not a "tie-line"
 system.

 Any IBMers on the list should speak up. My understanding is that IBM has
 internal numbers ("tie line" is the name you find on their business
 cards) have nothing to do with their externally-reachable numbers.

[MAP] Many large organizations have internal numbering systems, which often
have the same structure as "public" numbers (7 digits in the US). DISA has
one, in fact, they are so big they have area "codes", but these systems are
not called "tie-lines". These internal uniform numbering plans replace the
old systems, typically referred to as "tie-line systems" in which the
originator had to dial a sequence of "tie-line" access numbers, typically 1
or 2 digit numbers each, to step from system to system to get to the
destination. Those type networks were a pain, and I suspect are virtually
gone.

The point is, we should not refer to the mechanism used ("tie-lines" or
whatever), only the numbering system.

Mike Pierce
Artel

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