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Friday, 5 October 2012

SIP History-Info Header


The SIP History-Info Header defined in RFC 4244 provides a way of capturing any redirection information that may have occurred on a particular call. Without the SIP History-Info Header the redirecting information would be lost. The SIP History-Info Header is generated when a SIP request is re-targeted and can appear in any SIP request not associated with a dialog. The SIP History-Info header is generated by a User Agent or proxy and is passed from one entity to another through requests and responses. An example of the SIP History Header is shown below.


The SIP History-Info Header displays the following:
  • The URI or address that indicates the redirecting number
  • The reason for the Request-URI or address modification
  • Chronological ordering of the Request History information

The SIP History-Info Header is enabled in the SIP Headers pane which is created under the SIP SGP profile pane. See screen capture below of SIP Headers pane.



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