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SIP Extensions for High Availability and Load Balancing for Public Cloud

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Jonathan Rosenberg , Cullen Fluffy Jennings , Tolga Asveren
Last updated 2021-08-25 (Latest revision 2021-02-21)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


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.


Jonathan Rosenberg
Cullen Fluffy Jennings
Tolga Asveren

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)