Source note · Echo on VoIP calls
Cisco states that an echo must be delayed by at least 20 milliseconds before a user perceives it.
Checked 2026-09-25
Echos must be delayed by at least 20 milliseconds in order to be perceived.
- Vendor
- Cisco
- Product
- Cisco IOS voice gateways
- Subsystem
- delay-thresholds
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented 2008-04-02
- Checked
- 2026-09-25
Sources
- Troubleshooting Echo Problems between IP Phones and IOS Gateways — Cisco · tier 2 current vendor documentation · Introduction
Cite this note
APA
WarmTransfer. (2026, September 25). Echo on VoIP calls: source note echo-on-calls-perception-20ms. WarmTransfer. https://warmtransfer.net/knowledge/claims/echo-on-calls-perception-20ms
BibTeX
@misc{warmtransfer-claim-echo-on-calls-perception-20ms,
title = {Echo on VoIP calls: source note echo-on-calls-perception-20ms},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/echo-on-calls-perception-20ms},
note = {Source note echo-on-calls-perception-20ms, checked 2026-09-25}
}