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RFC 5502, "The SIP P-Served-User Private-Header (P-Header) for the 3GPP IP Multimedia (IM) Core Network (CN) Subsystem", April 2009

Note: This RFC has been updated by RFC 8217, RFC 8498

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: rai

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Errata ID: 4827
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Dale R. Worley
Date Reported: 2016-10-11

Section 6 says:

   sessioncase-param        = "sescase" EQUAL "orig" / "term"
   registration-state-param = "regstate" EQUAL "unreg" / "reg"

It should say:

   sessioncase-param        = "sescase" EQUAL ( "orig" / "term" )
   registration-state-param = "regstate" EQUAL ( "unreg" / "reg" )

Notes:

The ABNF as written does not take into account that concatenation binds tighter than alternation.

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