Source note · Echo on VoIP calls
The Asterisk chan_dahdi echotraining option mutes the channel briefly, sends an impulse to pre-train the canceller (default delay 400 ms), and the sample warns it can make echo worse in some cases.
Checked 2026-09-25
In some cases this option can make echo worse!
- Vendor
- Asterisk
- Product
- chan_dahdi
- Subsystem
- echo-canceller-tuning
- Deployment
- on-premises
- Region
- not restricted
- Release range
- master branch as of 2026-09-25
- Checked
- 2026-09-25
Sources
- asterisk/configs/samples/chan_dahdi.conf.sample — Asterisk project (Sangoma) · tier 3 vendor-maintained repositories · chan_dahdi.conf.sample, echotraining comment block
Cite this note
APA
WarmTransfer. (2026, September 25). Echo on VoIP calls: source note echo-on-calls-dahdi-echotraining-worse. WarmTransfer. https://warmtransfer.net/knowledge/claims/echo-on-calls-dahdi-echotraining-worse
BibTeX
@misc{warmtransfer-claim-echo-on-calls-dahdi-echotraining-worse,
title = {Echo on VoIP calls: source note echo-on-calls-dahdi-echotraining-worse},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/echo-on-calls-dahdi-echotraining-worse},
note = {Source note echo-on-calls-dahdi-echotraining-worse, checked 2026-09-25}
}