In RFC 3261 the From header indicates the logical identity of the request initiator, possibly the user's address-of-record, and is supplied by the user agent rather than asserted by the network.
Checked 2026-10-02
The From header field indicates the logical identity of the initiator of the request, possibly the user's address-of-record.
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- From header
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- RFC 3261
- Checked
- 2026-10-02
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 8.1.1.3 (From)
Cite this note
APA
WarmTransfer. (2026, October 2). SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-from-logical-identity. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-identity-headers-from-logical-identity
BibTeX
@misc{warmtransfer-claim-sip-identity-headers-from-logical-identity,
title = {SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-from-logical-identity},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-identity-headers-from-logical-identity},
note = {Source note sip-identity-headers-from-logical-identity, checked 2026-10-02}
}