Design Considerations for Session Initiation Protocol (SIP) Overload Control

Document Type Replaced Internet-Draft (6lowpan WG)
Authors Volker Hilt  , Eric Noel  , Charles Shen  , Ahmed Abdelal 
Last updated 2017-03-20 (latest revision 2009-07-11)
Replaced by draft-hilt-soc-overload-design
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Replaced by draft-hilt-soc-overload-design
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Overload occurs in Session Initiation Protocol (SIP) networks when SIP servers have insufficient resources to handle all SIP messages they receive. Even though the SIP protocol provides a limited overload control mechanism through its 503 (Service Unavailable) response code, SIP servers are still vulnerable to overload. This document discusses models and design considerations for a SIP overload control mechanism.


Volker Hilt (
Eric Noel (
Charles Shen (
Ahmed Abdelal (

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