Requirements from Session Initiation Protocol (SIP) Session Border Control (SBC) Deployments
RFC 5853
Internet Engineering Task Force (IETF) J. Hautakorpi, Ed.
Request for Comments: 5853 G. Camarillo
Category: Informational Ericsson
ISSN: 2070-1721 R. Penfield
Acme Packet
A. Hawrylyshen
Skype, Inc.
M. Bhatia
3CLogic
April 2010
Requirements from Session Initiation Protocol (SIP)
Session Border Control (SBC) Deployments
Abstract
This document describes functions implemented in Session Initiation
Protocol (SIP) intermediaries known as Session Border Controllers
(SBCs). The goal of this document is to describe the commonly
provided functions of SBCs. A special focus is given to those
practices that are viewed to be in conflict with SIP architectural
principles. This document also explores the underlying requirements
of network operators that have led to the use of these functions and
practices in order to identify protocol requirements and determine
whether those requirements are satisfied by existing specifications
or if additional standards work is required.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5853.
Hautakorpi, et al. Informational [Page 1]
RFC 5853 Requirements from SIP SBC Deployments April 2010
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Hautakorpi, et al. Informational [Page 2]
RFC 5853 Requirements from SIP SBC Deployments April 2010
Table of Contents
1. Introduction ....................................................4
2. Background on SBCs ..............................................4
2.1. Peering Scenario ...........................................6
2.2. Access Scenario ............................................6
3. Functions of SBCs ...............................................8
3.1. Topology Hiding ............................................8
3.1.1. General Information and Requirements ................8
3.1.2. Architectural Issues ................................9
3.1.3. Example .............................................9
3.2. Media Traffic Management ..................................11
3.2.1. General Information and Requirements ...............11
3.2.2. Architectural Issues ...............................12
3.2.3. Example ............................................13
3.3. Fixing Capability Mismatches ..............................14
3.3.1. General Information and Requirements ...............14
3.3.2. Architectural Issues ...............................14
3.3.3. Example ............................................15
3.4. Maintaining SIP-Related NAT Bindings ......................15
3.4.1. General Information and Requirements ...............15
3.4.2. Architectural Issues ...............................16
3.4.3. Example ............................................17
3.5. Access Control ............................................18
3.5.1. General Information and Requirements ...............18
3.5.2. Architectural Issues ...............................19
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