Session Initiation Protocol (SIP) Resource availability Event package
Sheshadri Shalya, R Parthasarathi · 2010
Overload occurs in Session Initiation Protocol (SIP) networks when B2BUA, proxies, and user agents have insufficient resources like CPU, memory, DSP, or bandwidth to complete the processing of a request. SIP provides limited support for overload handling through its 503 response code, which tells an upstream element that it is overloaded. This document defines explicit SIP based resource monitoring and overload avoidance mechanism based on the resource availability of the entity.