Session Initiation Protocol (SIP) Non-eXempt Rate Control
draft-williams-soc-nxrate-control-00

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Last updated 2019-10-03
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Internet-Draft                                       P M Williams, Ed.
SOC Working Group (concluded)                      NICC Standards & BT
Intended status: Standards Track
Expires: April 3, 2020                                 October 3, 2019

         Session Initiation Protocol (SIP) Non-eXempt Rate Control
                  draft-williams-soc-nxrate-control-00.txt

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   carefully, as they describe your rights and restrictions with respect
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Abstract

   A SIP overload control signalling protocol framework has previously
   been published, with the flexibility to allow different SIP request
   rate limiting algorithms to be selected. This document proposes a
   similar algorithm of maximum rate type with two advantages over
   existing proposals. Firstly, it exempts certain classes of SIP
   requests that are fundamental to correct operation of the SIP
   protocol which, if rejected by control, would worsen rather than
   improve SIP performance. Secondly, it allows target servers to
   control SIP traffic from sources not compliant with this document so
   that it can be deployed in heterogeneous network environments.

Table of Contents

   1. Introduction ................................................ 3
   2. Terminology ................................................. 4
   3. Overview .................................................... 5
   4. Request priorities, including exemption from restriction .... 5
      4.1. Exempt request methods ................................. 6
      4.2. Non-exempt request priorities .......................... 7
         4.2.1. Factors determining priorities of within dialogue
                request methods ................................... 7
         4.2.2. Illustrative numerical values of priority ......... 8
   5. "nxrate" token for oc-algo parameter value ................. 10
      5.1. Control algorithm selection ........................... 11
   6. Rate control algorithm ..................................... 11
      6.1. Target server rate control for non-compliant or non-
           conforming sources (clients) .......................... 12
         6.1.1. Enhanced rate control algorithm for target server  13
         6.1.2. Rate controller allocation and treatment of requests 
                for a target server .............................. 14
         6.1.3. Summary of performance characteristics of the
                solution ......................................... 14
         6.1.4. Steady-state outcome rates of the enhanced target
                rate control ..................................... 15
   7. Server operation ........................................... 16
      7.1. Control rate (oc value) allocation over sources ....... 16
      7.2. Overload control objectives ........................... 17
   8. Target server failover configuration ....................... 18
      8.1. oc-validity values .................................... 18
      8.2. oc-seq values ......................................... 21

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         8.2.1. Control state is shared .......................... 21
         8.2.2. Control state is not shared ...................... 21
      8.3. Relationship of source restrictor to a target and its
           standby ............................................... 22
   9. Example - including failover ............................... 23
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