Source note · Troubleshooting fax over IP failures
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.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IOS
- Subsystem
- fax protocol t38
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS command reference dated 2007
- Checked
- 2026-10-02
Sources
- Cisco IOS Voice Command Reference - F — Cisco Systems · tier 2 current vendor documentation · fax protocol t38 (dial peer), Command Default
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-default-fallback. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-default-fallback
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-t38-default-fallback,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-default-fallback},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-default-fallback},
note = {Source note fax-over-ip-troubleshooting-t38-default-fallback, checked 2026-10-02}
}