Hello,  I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review.  Document editors and WG chairs should treat these comments just like any other last call comments. This intended status of this document is Informational. This document makes some corrections to the ABNF of RFC 7315 which defines the Private Header (P-Header) extensions for the SIP protocol for the 3GPP. The Nits tool found no issues with the document. RFC 7315 has Category "Informational" (I'm not sure why) but I guess that would explain why this document has  intended status of Informational. Looking at the content of this draft, I wonder whether it shouldn't be an errata document on RFC7315 as it just listing corrections to that document. I have no other issues with the document. Thank you kindly, Menachem Dodge