Source note · Early media and ringback behavior

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.

Checked 2026-09-24

Vendor: IETF
Product: SIP
Subsystem: early media authorization
Deployment: any
Region: not restricted
Release range: RFC 5009
Checked: 2026-09-24

Sources

RFC 5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media — IETF / RFC Editor · tier 1 standards and regulators · Section 2 (Applicability Statement)

Cite this note

APA

WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-p-early-media-trust-domain. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-p-early-media-trust-domain

BibTeX

@misc{warmtransfer-claim-early-media-ringback-p-early-media-trust-domain,
  title  = {Early media and ringback behavior: source note early-media-ringback-p-early-media-trust-domain},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/early-media-ringback-p-early-media-trust-domain},
  note   = {Source note early-media-ringback-p-early-media-trust-domain, checked 2026-09-24}
}

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