A Taxonomy of Session Initiation Protocol (SIP) Back-to-Back User Agents
draft-ietf-straw-b2bua-taxonomy-00

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STRAW Working Group                                           H. Kaplan 
Internet Draft                                              Acme Packet 
Intended status: Informational                         November 6, 2012 
Expires: May 22, 2013                                                   
    
    
              A Taxonomy of Session Initiation Protocol (SIP) 
                         Back-to-Back User Agents 
                    draft-ietf-straw-b2bua-taxonomy-00 
    
    
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Internet-Draft            Taxonomy of B2BUAs             November 2012 
 
 
Abstract 
    
   There are numerous types of SIP Back-to-Back User Agents (B2BUAs), 
   performing different roles in different ways.  This document 
   identifies several common B2BUA roles, in order to provide taxonomy 
   other documents can use and reference. 
    
    
Table of Contents 
    
   1. Terminology...................................................2 
   2. Introduction..................................................3 
   3. B2BUA Role Types..............................................3 
      3.1. Signaling-plane B2BUA Roles..............................4 
         3.1.1 Proxy-B2BUA 4 
         3.1.2 Signaling-only 4 
         3.1.3 SDP-Modifying Signaling-only  5 
      3.2. Media-plane B2BUA Roles..................................5 
         3.2.1 Media-relay 5 
         3.2.2 Media-aware 6 
         3.2.3 Media-termination 6 
   4. Mapping SIP Device Types to B2BUA Roles.......................6 
      4.1. SIP PBXs and Softswitches................................6 
      4.2. Application Servers......................................6 
      4.3. Session Border Controllers...............................7 
      4.4. Transcoders..............................................7 
      4.5. Conference Servers.......................................7 
      4.6. P-CSCF and IBCF Functions................................8 
      4.7. S-CSCF Function..........................................8 
   5. Security Considerations.......................................8 
   6. IANA Considerations...........................................8 
   7. Acknowledgments...............................................8 
   8. References....................................................8 
      8.1. Informative References...................................8 
   Author's Address..................................................9 
    
    
1. Terminology 
    
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 
   document are to be interpreted as described in RFC 2119.  The 
   terminology in this document conforms to RFC 2828, "Internet 
   Security Glossary". 
    
   B2BUA: a SIP Back-to-Back User Agent, which is the logical 
   combination of a User Agent Server (UAS) and User Agent Client 
   (UAC). 
    
 
 
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Internet-Draft            Taxonomy of B2BUAs             November 2012 
 
 
   UAS: a SIP User Agent Server. 
    
   UAC: a SIP User Agent Client. 
    
2. Introduction 
    
   In many SIP deployments, SIP entities exist in the SIP signaling 
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