Source note · Early media and ringback behavior
On a Cisco gateway or CUBE, a 183 with SDP from a far end that then sends no audio will likely leave the caller with silence rather than local ringback, because the 183 always gets cut-through and 180-based local ringback is not triggered.
inferred · Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- SIP provisional response handling
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.6 onwards guide
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards: SIP Enhanced 180 Provisional Response Handling — Cisco Systems · tier 2 current vendor documentation · SIP Enhanced 180 Provisional Response Handling > treatment of 183 with SDP; combined with RFC 3960 Section 3.2
Cite this note
APA
WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-183-silence-inference. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-183-silence-inference
BibTeX
@misc{warmtransfer-claim-early-media-ringback-183-silence-inference,
title = {Early media and ringback behavior: source note early-media-ringback-183-silence-inference},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/early-media-ringback-183-silence-inference},
note = {Source note early-media-ringback-183-silence-inference, checked 2026-09-24}
}