Source note · Early media and ringback behavior

On Cisco IOS/IOS XE gateways and CUBE, a 183 response with SDP always gets early media cut-through; the disable-early-media 180 setting does not affect it.

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
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 table / information section

Cite this note

APA

WarmTransfer. (2026, September 24). Early media and ringback behavior: source note early-media-ringback-cube-183-always-cut. WarmTransfer. https://warmtransfer.net/knowledge/claims/early-media-ringback-cube-183-always-cut

BibTeX

@misc{warmtransfer-claim-early-media-ringback-cube-183-always-cut,
  title  = {Early media and ringback behavior: source note early-media-ringback-cube-183-always-cut},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/early-media-ringback-cube-183-always-cut},
  note   = {Source note early-media-ringback-cube-183-always-cut, checked 2026-09-24}
}

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