Subject: Re: [NSIS] [Requirements draft] Scenarios

From: Bob Braden <[email-masked]>
Date: Thu, 24 Oct 2002 17:49:40 GMT

*> 
  *> I believe the Appendix of the [Requirements draft] could be enhanced with
  *> scenarios from the ISC Reference Arquitecture.
  *> 
  *> http://www.softswitch.org/attachments/Reference_Architecture_5-02.pdf
  *> 

Well, maybe yes, maybe no.  Voice over IP is certainly an important
potential application of NSIS protocols, but by no means the only one,
and in the long run it might not even be the most important.  (Ask
me sometime about my success in predicting the future of the Internet ;-))

However, I would note that driving NSIS from VoIP requiremetns would
entangle the NSIS WG with a hugely complex
telephone infrastructure.  Trying too hard to accommodate its
complexities is likely to distort our efforts and lead us away from
the more important goals of generality and extensibility.  I have the same uneasy
feelinga about the wireless material in the Appendix, BTW.  What we need
is some abstraction of the requirements of VoIP and of wireless.  In the
Internet we want signaling protocols that are flexible, generel, and
extensible.  As you penetrate deep into wireless networks or into the
phone network, I would expect special-purpose signaling protocols to
be used.  It seems to me that the right way to model these complex
special environments is as individual link layers, with IP over top.
Just as RSVP can invoke link layer signaling, e.g., ATM (RFC2382) or
IEEE 802 (RFC 2814), so an Internet NSIS signaling protocol can invoke
the wireless or phone network signaling protocol.

I would rather see much less emphasis on telephony in the Appendx,
and a broader range of Internet signaling applications.

Bob Braden

  *> Network Examples
  *> ............................................................................
  *> .......................13
  *> Wireline Network
  *> ............................................................................
  *> ...................................................13
  *> All-IP Network....14
  *> VoIP Tandem
  *> Switching...................................................................
  *> .................................................16
  *> POTS Carried over IP
  *> ............................................................................
  *> ...........................................16
  *> Access Network (V5/ISDN) over
  *> IP..........................................................................
  *> .........................17
  *> Cable Network (e.g. PacketCable(tm)) over
  *> IP..........................................................................
  *> ..........17
  *> VoDSL and IAD over IP
  *> ............................................................................
  *> ........................................18
  *> Wireless (3GPP R99 Special Case NGN)
  *> ............................................................................
  *> ............19
  *> Wireless (3GPP R2000 General Case all IP)
  *> ............................................................................
  *> .......19
  *> WCDMA Mobile Network
  *> ............................................................................
  *> ......................................20
  *> 
  *> Alejandro Avella
  *> 
  *> [Requirements draft]
  *> http://www.ietf.org/internet-drafts/draft-ietf-nsis-req-04.txt
  *> 
  *> 
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