Source note · Troubleshooting fax over IP failures
Bandwidth states that if the T.38 re-INVITE is unsuccessful a SIP 488 Not Acceptable Here is sent and transmission should fall back to G.711.
Checked 2026-10-02
- Vendor
- Bandwidth
- Product
- Bandwidth SIP trunking
- Subsystem
- T.38
- Deployment
- multi-tenant
- Region
- us
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Bandwidth T.38 faxing support guide — Bandwidth Inc. · tier 2 current vendor documentation · T.38 support section
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-bw-488-fallback. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-bw-488-fallback
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-bw-488-fallback,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-bw-488-fallback},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-bw-488-fallback},
note = {Source note fax-over-ip-troubleshooting-bw-488-fallback, checked 2026-10-02}
}