RFC 7044, "An Extension to the Session Initiation Protocol (SIP) for Request History Information", February 2014

Errata ID: 5442
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Ted Zhou
Date Reported: 2018-07-27

Section 9.3,10.2 says:

9.3   
   When a SIP entity receives a non-100 response or a request times out,
   the SIP entity performs the following steps:

      If the response is not a 100 or 2xx response, the SIP entity adds
      one or more Reason header fields to the hi-targeted-to-uri in the
      (newly) cached hi-entry reflecting the SIP response code in the
      non-100 or non-2xx response, per the procedures of Section 10.2.

10.2
   A Reason header field is added when the hi-entry is added to the
   cache based upon the receipt of a SIP response that is neither a 100
   nor a 2xx response, as described in Section 9.3. 

It should say:

9.3   
   When a SIP entity receives a non-18x response or a request times out,
   the SIP entity performs the following steps:

      If the response is not a 18x or 2xx response, the SIP entity adds
      one or more Reason header fields to the hi-targeted-to-uri in the
      (newly) cached hi-entry reflecting the SIP response code in the
      non-18x or non-2xx response, per the procedures of Section 10.2.

10.2
   A Reason header field is added when the hi-entry is added to the
   cache based upon the receipt of a SIP response that is neither a 18x
   nor a 2xx response, as described in Section 9.3. 

Notes:

I see we have several places using "100" or "non-100". I think the correct one should be "18x" or "non-18x".
Or, we can use "1xx" or "non-1xx".

100 means "100 Tring", it's not accurate.

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