1. Introduction

This page preserves the RFC text for the section and adds navigation metadata for the documentation site.

RFC Text

1. Introduction

The Third Generation Partnership Project (3GPP) has identified cases where different Session Initiation Protocol (SIP) [RFC3261] private header extensions referred to as "P-" header fields, and defined in [RFC7315], need to be included in SIP requests and responses where they were not allowed according to [RFC7315]. This document updates [RFC7315], in order to allow inclusion of the affected "P-" header fields in such requests and responses.

This document also makes updates to [RFC7315] in order to fix misalignments that occurred when [RFC3455] was updated and subsequently obsoleted by the publication of [RFC7315].