Source note · Early media and ringback behavior
RFC 3960 states that a 180 (Ringing) response means the callee is being alerted, and a UAS should send it when the callee is being alerted regardless of the status of the early media session.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP
- Subsystem
- provisional responses
- 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), note after the policy list
Cite this note
APA
WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-180-means-alerting. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-180-means-alerting
BibTeX
@misc{warmtransfer-claim-early-media-ringback-180-means-alerting,
title = {Early media and ringback behavior: source note early-media-ringback-180-means-alerting},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/early-media-ringback-180-means-alerting},
note = {Source note early-media-ringback-180-means-alerting, checked 2026-09-24}
}