Source note · Troubleshooting fax over IP failures
RFC 6913 says a calling user agent placing a fax call SHOULD include the sip.fax media feature tag in the Accept-Contact header of the INVITE.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP fax capability
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 6913, March 2013
- Checked
- 2026-10-02
Sources
- Indicating Fax over IP Capability in the Session Initiation Protocol (SIP) — IETF RFC Editor · tier 1 standards and regulators · Section 4
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-rfc6913-accept-contact. WarmTransfer. https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-rfc6913-accept-contact
BibTeX
@misc{warmtransfer-claim-fax-over-ip-troubleshooting-rfc6913-accept-contact,
title = {Troubleshooting fax over IP failures: source note fax-over-ip-troubleshooting-rfc6913-accept-contact},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/fax-over-ip-troubleshooting-rfc6913-accept-contact},
note = {Source note fax-over-ip-troubleshooting-rfc6913-accept-contact, checked 2026-10-02}
}