Network Working Group J. Polk
Request for Comments: 3523 Cisco Systems
Category: Informational April 2003
Network Working Group J. Polk
Request for Comments: 3523 Cisco Systems
Category: Informational April 2003
Internet Emergency Preparedness (IEPREP) Telephony Topology Terminology
互联网应急准备（IEPREP）电话拓扑术语
Status of this Memo
本备忘录的状况
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
本备忘录为互联网社区提供信息。它没有规定任何类型的互联网标准。本备忘录的分发不受限制。
Copyright Notice
版权公告
Copyright (C) The Internet Society (2003). All Rights Reserved.
版权所有（C）互联网协会（2003年）。版权所有。
Abstract
摘要
This document defines the topology naming conventions that are to be used in reference to Internet Emergency Preparedness (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.
本文档定义了用于互联网应急准备（IEPREP）电话呼叫的拓扑命名约定。在讨论期间以及编写需求、差距分析和其他解决方案文档时，应使用这些命名约定来关注IEPREP工作组。
Table of Contents
目录
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Motivation. . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Terms and Definitions . . . . . . . . . . . . . . . . . . 2
2. IEPREP Topologies. . . . . . . . . . . . . . . . . . . . . . 2
2.1 Topology "IP Bridging" . . . . . . . . . . . . . . . . . 3
2.2 Topology "IP at the Start". . . . . . . . . . . . . . . . 3
2.3 Topology "IP at the End". . . . . . . . . . . . . . . . . 4
2.4 Topology "End-to-End IP". . . . . . . . . . . . . . . . . 4
3. Security Considerations . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7. Author's Address. . . . . . . . . . . . . . . . . . . . . . . 5
8. Full Copyright Statement. . . . . . . . . . . . . . . . . . . 6
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Motivation. . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Terms and Definitions . . . . . . . . . . . . . . . . . . 2
2. IEPREP Topologies. . . . . . . . . . . . . . . . . . . . . . 2
2.1 Topology "IP Bridging" . . . . . . . . . . . . . . . . . 3
2.2 Topology "IP at the Start". . . . . . . . . . . . . . . . 3
2.3 Topology "IP at the End". . . . . . . . . . . . . . . . . 4
2.4 Topology "End-to-End IP". . . . . . . . . . . . . . . . . 4
3. Security Considerations . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7. Author's Address. . . . . . . . . . . . . . . . . . . . . . . 5
8. Full Copyright Statement. . . . . . . . . . . . . . . . . . . 6
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 (WG) during discussions and when writing requirements, gap analysis and other solutions documents.
本文档定义了用于IEPREP电话呼叫的拓扑命名约定。在讨论期间以及编写需求、差距分析和其他解决方案文档时，应使用这些命名约定来关注IEPREP工作组（WG）。
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.
IEPREP列表上以及每次会议中都有很多关于IEPREP考虑的拓扑的混乱。希望本文档能为每位读者和作者提供一组命名体系结构的参考。
This memo attempts to be agnostic with regard to IP signaling or control protocols (SIP, MEGACO, etc), as well as any underlying Quality of Service (QOS) mechanisms (Diffserv, RSVP, NSIS, etc).
本备忘录试图对IP信令或控制协议（SIP、MEGACO等）以及任何基础服务质量（QOS）机制（区分服务、RSVP、NSIS等）不可知。
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.
简言之，让每个人都参考相同的（命名的）拓扑，以便进行有用且不那么混乱的对话，以进一步推动该工作组的工作。
The following acronyms need to be exploded for clarity:
为清晰起见，需要对以下首字母缩略词进行分解：
CSN = Circuit Switched Network
CSN = Circuit Switched Network
GW = Gateway (CSN to IP, or IP to CSN)
GW=网关（CSN到IP或IP到CSN）
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.
到目前为止，本工作组的工作中经常提到4种拓扑结构，但很少有文档记录。以下小节对每种拓扑进行了命名和描述。
The 4 topologies are (quickly):
这4种拓扑结构（很快）：
Topology "IP Bridging"
拓扑“IP桥接”
Topology "IP at the Start"
拓扑“起始IP”
Topology "IP at the End"
拓扑“末端IP”
Topology "End-to-End IP"
拓扑“端到端IP”
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.
这种拓扑有时被称为两个CSN的“中间IP”。在这种拓扑结构中，任何类型的CSN电话都会通过两个CSN之间的IP核心向另一个CSN电话发起（拨号）呼叫。
This topology should simplistically look like this:
此拓扑应简单地如下所示：
Circuit Internet Circuit
Switched IP or IP Switched
Network Ingress IP Segment Egress Network
-----------+ +--------------+ +-----------
| +----+ | IP | +----+ |
CSN | | | | | | | | CSN
Phone ------->| GW |----------------------->| GW |-------->Phone
| | | | | | | |
| +----+ | | +----+ |
-----------+ +--------------+ +-----------
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"
图1。拓扑“IP桥接”
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.
此拓扑具有发起方从IP电话（PDA或计算机）拨打（拨号）呼叫，被叫方驻留在CSN中。
Internet Circuit
or CSN Switched
IP Segment Ingress Network
-------------------+ +---------------
| +----+ |
IP | | | | CSN
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Internet Circuit
or CSN Switched
IP Segment Ingress Network
-------------------+ +---------------
| +----+ |
IP | | | | CSN
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Figure 2. Topology "IP at the Start"
图2。拓扑“起始IP”
This topology has the calling party placing the call from a CSN phone, and the called party being in an IP network.
此拓扑结构使主叫方从CSN电话拨打电话，被叫方位于IP网络中。
Circuit Internet
Switched CSN or
Network Egress IP Segment
-------------------+ +---------------
| +----+ |
CSN | | | | IP
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Circuit Internet
Switched CSN or
Network Egress IP Segment
-------------------+ +---------------
| +----+ |
CSN | | | | IP
Phone ------------------>| GW |--------> Phone
| | | |
| +----+ |
-------------------+ +---------------
Figure 3. Topology "IP at the End"
图3。拓扑“末端IP”
This topology has no circuit switched sections in the call path.
此拓扑在呼叫路径中没有电路交换部分。
Internet
or
IP Network
+-----------------------------------------+
| |
+---------+ +-----------+
| |
| IP IP |
| Phone --------------------------------------------> Phone |
| |
+---------+ +-----------+
| |
+-----------------------------------------+
Internet
or
IP Network
+-----------------------------------------+
| |
+---------+ +-----------+
| |
| IP IP |
| Phone --------------------------------------------> Phone |
| |
+---------+ +-----------+
| |
+-----------------------------------------+
Figure 4. Topology "End to End IP"
图4。拓扑“端到端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.
虽然这里显示为一个大型IP云，但Internet由一系列松散连接的IP域组成。端到端IP呼叫可能会穿越多个域和/或多个网络提供商，这可能会影响呼叫。
This document merely suggests a common naming convention within IEPREP WG discussions, therefore there are no special security considerations.
本文档仅建议IEPREP工作组讨论中的通用命名约定，因此没有特殊的安全考虑。
There are no IANA considerations within this document.
本文件中没有IANA注意事项。
To Scott Bradner, Kimberly King and Mike Pierce for their comments and suggestions.
感谢斯科特·布拉德纳、金伯利·金和迈克·皮尔斯的评论和建议。
There are no references at the present time.
目前没有参考文献。
James M. Polk Cisco Systems 2200 East President George Bush Turnpike Richardson, Texas 75082 USA
詹姆斯·M·波尔克思科系统2200美国德克萨斯州东总统乔治·布什收费公路理查森75082
EMail: jmpolk@cisco.com
EMail: jmpolk@cisco.com
Copyright (C) The Internet Society (2003). All Rights Reserved.
版权所有（C）互联网协会（2003年）。版权所有。
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Acknowledgement
确认
Funding for the RFC Editor function is currently provided by the Internet Society.
RFC编辑功能的资金目前由互联网协会提供。