Cisco IOS Voice Command Reference - D through I - E

Publisher

Cisco

URL

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/vcr2/vcr2-cr-book/vcr-e1.html

Published

2026-04-25

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• The current Cisco IOS voice command reference lists echo-cancel coverage values of 24, 32, 48, 64, 80, 96, 112 and 128 ms, with a default of 128 ms. disputed in context
• Cisco says a larger echo-cancel coverage value makes the echo canceller take longer to converge. in context
• Cisco says that if the local loop, meaning the delay from the interface to the equipment producing the echo, is longer than the configured echo-cancel coverage, the coverage should be increased. in context
• Cisco warns that disabling echo cancellation on a voice port might cause the remote side of the connection to hear echo. in context
• Cisco describes echo cancellation as an invasive process that can minimally degrade voice quality, and says it should be disabled if not needed. in context
• The Cisco echo-cancel loopback command puts the echo canceller in loopback for diagnostics; if cancellation fails in loopback, the interface is the source of the problem. in context
• Cisco documents echo-cancel mode 2 for the extended G.168 canceller as fast convergence with improved double-talk detection, most useful on analog interfaces with multiple echo reflectors and low-volume double-talk. in context
• Cisco states that echo-cancel enable does not affect the echo heard by the user on the analog side of the connection. in context
• The Cisco IOS echo-cancel enable command cancels voice that is sent out an interface and received back on the same interface. in context
• Cisco says a hybrid circuit typically provides more than 6 dB ERL, so the extended echo canceller is configured for a 6 dB worst case by default, and it can be set lower if measurement shows the circuit gives 6 dB or less. in context
• On Cisco IOS voice ports the Cisco G.168 echo canceller is enabled by default with the echo suppressor turned off, and the suppressor can be turned on only when that default canceller is in use. in context

Cite this source record

APA

WarmTransfer. (2026, April 25). Cisco IOS Voice Command Reference - D through I - E. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-ios-voice-cmdref-e-commands

BibTeX

@misc{warmtransfer-cisco-ios-voice-cmdref-e-commands,
  title  = {Cisco IOS Voice Command Reference - D through I - E},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-ios-voice-cmdref-e-commands},
  note   = {Cisco, accessed 2026-09-25}
}