{"draft":"draft-ietf-sipcore-rfc7976bis-04","doc_id":"RFC9878","title":"Updates to Private Header (P-Header) Extension Usage in Session Initiation Protocol (SIP) Requests and Responses","authors":["C. Holmberg","N. Biondic","G. Salgueiro","R. Jesske"],"format":["HTML","TEXT","PDF","XML"],"page_count":"9","pub_status":"INFORMATIONAL","status":"INFORMATIONAL","source":"Session Initiation Protocol Core","abstract":"The Third Generation Partnership Project (3GPP) has identified cases\r\nwhere different SIP private header extensions referred to as \"P-\"\r\nheader fields, and defined in RFC 7315, need to be included in SIP\r\nrequests and responses where they were not allowed according to RFC\r\n7315. This document updates RFC 7315, in order to allow inclusion of\r\nthe affected \"P-\" header fields in such requests and responses. This\r\ndocument obsoletes RFC 7976. The changes related to RFC 7976 involve\r\nthe inclusion of the P-Visited-Network-ID header field in SIP\r\nresponses. \r\n\r\nThis document also makes updates to RFC 7315 in order to fix\r\nmisalignments that occurred when RFC 3455 was obsoleted by RFC 7315.","pub_date":"November 2025","keywords":["3GPP","Visited","ID"],"obsoletes":["RFC7976"],"obsoleted_by":[],"updates":["RFC7315"],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC9878","errata_url":null}