Source note · Early media and ringback behavior

Under the RFC 3960 policy, if a 180 (Ringing) has been received and incoming media packets are arriving, the UA plays them and does not generate local ringing, stopping any local ringing already under way.

Checked 2026-09-24

Vendor: IETF
Product: SIP
Subsystem: ringback generation
Deployment: any
Region: not restricted
Release range: RFC 3960
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), policy item 3 and following paragraph

Cite this note

APA

WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-policy-180-with-media. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-policy-180-with-media

BibTeX

@misc{warmtransfer-claim-early-media-ringback-policy-180-with-media,
  title  = {Early media and ringback behavior: source note early-media-ringback-policy-180-with-media},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/early-media-ringback-policy-180-with-media},
  note   = {Source note early-media-ringback-policy-180-with-media, checked 2026-09-24}
}

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