RFC 5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc5009.html

Published

2007-09-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

IETF Trust legal provisions; RFC text may be reproduced with attribution; short excerpts and locators only

Source notes citing this source

• RFC 5009 defines P-Early-Media parameters supported, sendrecv, sendonly, recvonly, inactive and gated; sendonly authorizes backward early media only (UAS to UAC) and inactive denies or revokes authorization. in context
• RFC 5009 defines the P-Early-Media header so that SIP networks can authorize cut-through of backward and/or forward early media when their early media policies allow it. in context
• RFC 5009 limits P-Early-Media to use inside a trust domain and says it is not applicable to inter-domain use or the Internet at large. in context
• RFC 5009 notes that a UAC can use P-Early-Media to decide whether to render early media from the UAS instead of local ringback triggered by a 180 Ringing response. in context

Cite this source record

APA

WarmTransfer. (2007, September 1). RFC 5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-5009-p-early-media

BibTeX

@misc{warmtransfer-rfc-5009-p-early-media,
  title  = {RFC 5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media},
  author = {{WarmTransfer}},
  year   = {2007},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-5009-p-early-media},
  note   = {IETF / RFC Editor, accessed 2026-09-24}
}