Source note · Early media and ringback behavior

RFC 3960's ringing-tone policy is keyed on 180 (Ringing) and incoming media; the fetched text did not show it assigning any role to 183 (Session Progress).

inferred · Checked 2026-09-24

Vendor: IETF
Product: SIP
Subsystem: provisional responses
Deployment: any
Region: not restricted
Release range: RFC 3960
Status: inferred
Checked: 2026-09-24

Sources

RFC 3960: Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 3.2 (Ringing Tone Generation); whole-document search reported by fetch

Cite this note

APA

WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-rfc3960-no-183. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-rfc3960-no-183

BibTeX

@misc{warmtransfer-claim-early-media-ringback-rfc3960-no-183,
  title  = {Early media and ringback behavior: source note early-media-ringback-rfc3960-no-183},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/early-media-ringback-rfc3960-no-183},
  note   = {Source note early-media-ringback-rfc3960-no-183, checked 2026-09-24}
}

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