Design Considerations for Session Initiation Protocol (SIP) Overload Control

Document Type Replaced Internet-Draft (individual)
Last updated 2010-08-24 (latest revision 2010-05-28)
Replaces draft-ietf-sipping-overload-design
Replaced by draft-ietf-soc-overload-design
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Expired & archived
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This Internet-Draft is no longer active.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.)