https://app.knowbase.one/vault/rfc/docid/9206
RFC8496: P-Charge-Info: A Private Header Field (P-Header) Extension to the Session Initiation Protocol (SIP)
Internet Engineering Task Force (IETF) D. York Request for Comments: 8496 Individual Category: Informational T. Asveren ISSN: 2070-1721 Ribbon Communications ...