Source note · Troubleshooting fax over IP failures
Cisco's Fax-SIP troubleshooting guide gives network limits for T.38 of delay under 1000 ms and jitter under 300 ms.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IOS voice gateways
- Subsystem
- network requirements
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented 2015
- Checked
- 2026-10-02
Sources
- Fax-SIP Troubleshoot Guide — Cisco Systems · tier 2 current vendor documentation · Network requirements / recommendations section
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-delay-jitter-max. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-delay-jitter-max
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-t38-delay-jitter-max,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-t38-delay-jitter-max},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-t38-delay-jitter-max},
note = {Source note fax-over-ip-troubleshooting-t38-delay-jitter-max, checked 2026-10-02}
}