SIP Extensions for High Availability and Load Balancing for Public Cloud
draft-rosenberg-dispatch-cloudsip-00

Document Type Active Internet-Draft (individual)
Authors Jonathan Rosenberg  , Cullen Jennings  , Tolga Asveren 
Last updated 2021-02-21
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Network Working Group                                       J. Rosenberg
Internet-Draft                                                     Five9
Expires: August 25, 2021                                     C. Jennings
                                                                   Cisco
                                                              T. Asveren
                                                   Ribbon Communications
                                                       February 21, 2021

SIP Extensions for High Availability and Load Balancing for Public Cloud
                   draft-rosenberg-dispatch-cloudsip-00

Abstract

   Software making use of the Session Initiation Protocol (SIP) faces
   challenges in achieving high availability, especially for call
   stateful applications like softswitches, Session Border Controllers
   (SBCs), and IP-based call centers applications.  The state maintained
   in the SIP, SDP and SRTP layers changes frequently, and is difficult
   to replicate.  For this reason, commercial systems have often relied
   on complex active-standby configurations making use of IP address
   takeover.  These solutions are also ill-suited for usage in modern
   public cloud environments.  This document defines a SIP extension
   facilitating HA, including keeping calls active, which is optimized
   for server-to-server communication where one or both sides are in
   public cloud.

Status of This Memo

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   This Internet-Draft will expire on August 25, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Rosenberg, et al.        Expires August 25, 2021                [Page 1]
Internet-Draft                  Cloud SIP                  February 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Relationship to RIPT  . . . . . . . . . . . . . . . . . . . .   5
   5.  Reference Architecture  . . . . . . . . . . . . . . . . . . .   5
   6.  Solution Applicability  . . . . . . . . . . . . . . . . . . .   6
   7.  Overview of Solution  . . . . . . . . . . . . . . . . . . . .   7
   8.  Configuration . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  SIP Behavioral Requirements . . . . . . . . . . . . . . . . .   9
     9.1.  Calling Server  . . . . . . . . . . . . . . . . . . . . .   9
       9.1.1.  Health Probing  . . . . . . . . . . . . . . . . . . .   9
       9.1.2.  Utilization Measurement . . . . . . . . . . . . . . .   9
       9.1.3.  New Call Initiation . . . . . . . . . . . . . . . . .  10
       9.1.4.  Instance Failure  . . . . . . . . . . . . . . . . . .  10
       9.1.5.  Instance to Inactive  . . . . . . . . . . . . . . . .  10
       9.1.6.  Receiving a REFER . . . . . . . . . . . . . . . . . .  11
     9.2.  Cluster Instances . . . . . . . . . . . . . . . . . . . .  11
       9.2.1.  Sending Utilization Values  . . . . . . . . . . . . .  11
       9.2.2.  Receiving INVITE w. Replaces  . . . . . . . . . . . .  12
       9.2.3.  Graceful Shutdown with Migration  . . . . . . . . . .  12
       9.2.4.  Graceful Shutdown without Migration . . . . . . . . .  12
     9.3.  Moving a Dialog . . . . . . . . . . . . . . . . . . . . .  13
   10. Cloud SIP Trunk Configuration File  . . . . . . . . . . . . .  13
   11. Webhook Registration Object . . . . . . . . . . . . . . . . .  14
   12. Instance-Utilization Header Field . . . . . . . . . . . . . .  14
   13. Why not DNS . . . . . . . . . . . . . . . . . . . . . . . . .  14
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