One document matched: draft-polk-ieprep-scenarios-03.txt-12516.txt
Differences from 03.txt-02.txt
Internet Engineering Task Force James M. Polk
Internet Draft Cisco Systems
Expiration: Sept 3rd, 2003
File: draft-polk-ieprep-scenarios-03.txt
IEPREP Telephony Topology Terminology
March 3rd, 2003
Status of this Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.
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Abstract
This document defines the topology naming conventions that are to be
used in reference to IEPREP phone calls. These naming conventions
should be used to focus the IEPREP Working Group during discussions and
when writing requirements, gap analysis and other solutions documents.
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Table of Contents
Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Changes from previous versions . . . . . . . . . . . . . . . . . . 2
1.3 Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . 3
2.0 IEPREP Topologies . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Topology "IP Bridging" . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Topology "IP at the Start" . . . . . . . . . . . . . . . . . . . . 4
2.3 Topology "IP at the End" . . . . . . . . . . . . . . . . . . . . . 4
2.4 Topology "End-to-End IP" . . . . . . . . . . . . . . . . . . . . . 5
3.0 Security Considerations . . . . . . . . . . . . . . . . . . . . . . 5
4.0 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . . . 5
5.0 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.0 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.0 Authors Information . . . . . . . . . . . . . . . . . . . . . . . . 6
1.0 Introduction
This document defines the topology naming conventions that are to be
used in reference to IEPREP phone calls. These naming conventions
should be used to focus the IEPREP Working Group during discussions and
when writing requirements, gap analysis and other solutions documents.
There has been much confusion on the IEPREP list as well as within each
meeting about the topologies IEPREP is considering. Hopefully this
document will give each reader and author a reference set of named
architectures.
This memo attempts to be agnostic with regard to IP signaling or control
protocols (SIP, MEGACO, etc), as well as any underlying QOS mechanisms
(Diffserv, RSVP, NSIS, etc).
1.1 Motivation
Simply put, to get everyone referencing the same (named) topologies in
order to have useful and less confusing dialog to further this working
group's efforts.
1.2 Changes From Previous Versions
Changes from -00 to -01
This version greatly reduces the text of the overall document by removing
all discussion of requirements and authentication & authorization. This is
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not a requirements document (therefore shouldn't state any), and the A&A
text/discussion for each of the topologies, though necessary within the
WG, has been moved to another "ieprep-topology-implications" document.
Changes from -01 to -02
Cleaned up minor omissions discovered that weren't omitted from the -00 to
-01 change.
Took out the paragraph following Figure 2 (section 2.2) referring to where
ETS aware devices should be.
1.3 Terms and Definitions
The following acronyms need to be exploded for clarity:
CSN = Circuit Switched Network
GW = Gateway (CSN to IP, or IP to CSN)
2.0 IEPREP Topologies
There are 4 often mentioned, but very little documented topologies
discussed within this WG's efforts so far. The following subsections name
and describe each of the topologies.
The 4 topologies are (quickly):
Topology "IP Bridging"
Topology "IP at the Start"
Topology "IP at the End"
Topology "End-to-End IP"
2.1 Topology "IP Bridging"
This topology is sometimes known as "IP in the Middle" of two CSNs. In
this topology, a CSN phone of any type initiates (dials) a call to another
CSN phone with an IP core between the two CSNs.
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This topology should simplistically look like this:
Circuit Internet Circuit
Switched IP or IP Switched
Network Ingress IP Segment Egress Network
-----------+ +--------------+ +-----------
| +----+ | IP | +----+ |
CSN | | | | | | | | CSN
Phone ------->| GW |----------------------->| GW |-------->Phone
| | | | | | | |
| +----+ | | +----+ |
-----------+ +--------------+ +-----------
Figure 1. Topology "IP Bridging"
2.2 Topology "IP at the Start"
This topology has the initiating party placing (dialing) the call from an
IP Phone (PDA or computer), and the called party residing in the CSN.
Internet Circuit
or CSN Switched
IP Segment Ingress Network
-------------------+ +---------------
| +----+ |
IP | | | | CSN
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Figure 2. Topology "IP at the Start"
2.3 Topology "IP at the End"
This topology has the calling party placing the call from a CSN phone, and
the called party being in an IP network.
Circuit Internet
Switched CSN or
Network Egress IP Segment
-------------------+ +---------------
| +----+ |
CSN | | | | IP
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Figure 3. Topology "IP at the End"
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2.4 Topology "End-to-End IP"
This topology has no circuit switched sections in the call path.
Internet
or
IP Network
+-----------------------------------------+
| |
+---------+ +-----------+
| |
| IP IP |
| Phone --------------------------------------------> Phone |
| |
+---------+ +-----------+
| |
+-----------------------------------------+
Figure 4. Topology "End to End IP"
Although shown as one large IP cloud here, the Internet is composed of
a series of loosely connected IP domains. An End-to-End IP call will
likely traverse a number of these domains and/or multiple network
providers, which may impact the call.
3.0 Security Considerations
This document merely suggests a common naming convention within IEPREP WG
discussions, therefore there are no special security considerations.
4.0 IANA Considerations
There are no IANA considerations within this document
5.0 Acknowledgements
To Scott Bradner, Kimberly King and Mike Pierce for their comments and
suggestions
6.0 References
none at this moment
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7.0 Authors Information
James M. Polk
Cisco Systems
2200 East President George Bush Turnpike
Richardson, Texas 75082 USA
jmpolk@cisco.com
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The Expiration date for this Internet Draft is:
June 3rd, 2003
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