Cisco IOS Voice Command Reference - F

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/ios/voice/command/reference/vr_book/vr_f1.html

Published

2007-10-15

Updated

unknown

Accessed

2026-10-02

HTTP status

200

License

Cisco proprietary; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• On Cisco IOS, a fax protocol t38 setting on a VoIP dial-peer takes precedence over the global voice service voip setting. in context
• Cisco fax relay disables ECM by having the DSP firmware modify the T.30 Digital Identification Signal (DIS) so the machines do not negotiate ECM. in context
• Setting T.38 hs-redundancy above 0 on Cisco IOS significantly increases the network bandwidth the fax call consumes. in context
• In the classic Cisco IOS command reference, fax protocol t38 defaults to ls-redundancy 0 hs-redundancy 0 fallback cisco, except on the AS5350, AS5400 and AS5850 where the fallback default is none. in context
• The Cisco IOS fax protocol t38 command offers fallback modes cisco, none, or pass-through g711ulaw or g711alaw, used when T.38 cannot be negotiated at fax time. in context

Cite this source record

APA

WarmTransfer. (2007, October 15). Cisco IOS Voice Command Reference - F. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-ios-voice-cmdref-f1

BibTeX

@misc{warmtransfer-cisco-ios-voice-cmdref-f1,
  title  = {Cisco IOS Voice Command Reference - F},
  author = {{WarmTransfer}},
  year   = {2007},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-ios-voice-cmdref-f1},
  note   = {Cisco Systems, accessed 2026-10-02}
}