Source note · Echo on VoIP calls
When a PSTN user hears echo on a call with an IP phone, Cisco identifies the cause as acoustic coupling between the earpiece and the microphone of the IP phone handset.
Checked 2026-09-25
The problem exists when the PSTN phone user hears echo which is caused by acoustic coupling between the earpiece and the microphone in the IP phone handset.
- Vendor
- Cisco
- Product
- Cisco IP phones with IOS gateways
- Subsystem
- echo-sources
- 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 · PSTN user hears echo section
Cite this note
APA
WarmTransfer. (2026, September 25). Echo on VoIP calls: source note echo-on-calls-acoustic-echo-ip-handset. WarmTransfer. https://warmtransfer.net/knowledge/claims/echo-on-calls-acoustic-echo-ip-handset
BibTeX
@misc{warmtransfer-claim-echo-on-calls-acoustic-echo-ip-handset,
title = {Echo on VoIP calls: source note echo-on-calls-acoustic-echo-ip-handset},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/echo-on-calls-acoustic-echo-ip-handset},
note = {Source note echo-on-calls-acoustic-echo-ip-handset, checked 2026-09-25}
}