A new Request for Comments is now available in online RFC libraries. RFC 7315 Title: Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3GPP Author: R. Jesske, K. Drage, C. Holmberg Status: Informational Stream: IETF Date: July 2014 Mailbox: r.jesske@telekom.de, drage@alcatel-lucent.com, christer.holmberg@ericsson.com Pages: 43 Characters: 101144 Obsoletes: RFC 3455 I-D Tag: draft-drage-sipping-rfc3455bis-14.txt URL: https://www.rfc-editor.org/rfc/rfc7315.txt This document describes a set of private header (P-header) Session Initiation Protocol (SIP) fields used by the 3GPP, along with their applicability, which is limited to particular environments. The P-header fields are used for a variety of purposes within the networks that the partners implement, including charging and information about the networks a call traverses. This document obsoletes RFC 3455. INFORMATIONAL: This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/rfc.html Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC