Source note · One-way and no-way audio diagnosis

Cisco states that because RTP streams have no connections and are transported over UDP, traffic may travel successfully in one direction but get lost in the opposite direction, which is the mechanism that makes one-way audio possible at all.

Checked 2026-09-16

Because RTP streams have no connections (transported over UDP), traffic may travel successfully in one direction but get lost in the opposite direction.

Vendor: Cisco
Product: Cisco Unified Communications Manager
Subsystem: media
Deployment: not restricted
Region: not restricted
Release range: not restricted
Checked: 2026-09-16

Sources

Troubleshooting Guide for Cisco Unified Communications Manager Release 12.5(1) — Device Issues — Cisco Systems, Inc. (www.cisco.com) · tier 2 current vendor documentation · One-Way Audio or No Audio, Check Basic IP Routing

Cite this note

APA

WarmTransfer. (2026, September 16). One-way and no-way audio diagnosis: source note owa-udp-has-no-connection-to-fail-symmetrically. WarmTransfer. https://warmtransfer.net/knowledge/claims/owa-udp-has-no-connection-to-fail-symmetrically

BibTeX

@misc{warmtransfer-claim-owa-udp-has-no-connection-to-fail-symmetrically,
  title  = {One-way and no-way audio diagnosis: source note owa-udp-has-no-connection-to-fail-symmetrically},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/owa-udp-has-no-connection-to-fail-symmetrically},
  note   = {Source note owa-udp-has-no-connection-to-fail-symmetrically, checked 2026-09-16}
}

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