Each History-Info entry carries an index made of dot-separated nonnegative integers (for example 1.1.2) that encodes forward hops and retargets as a tree.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- History-Info
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- RFC 7044
- Checked
- 2026-10-02
Sources
- RFC 7044: An Extension to the Session Initiation Protocol (SIP) for Request History Information — IETF / RFC Editor · tier 1 standards and regulators · Section 5 (History-Info Header Field Protocol Structure)
Cite this note
APA
WarmTransfer. (2026, October 2). SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-hi-index-format. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-identity-headers-hi-index-format
BibTeX
@misc{warmtransfer-claim-sip-identity-headers-hi-index-format,
title = {SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-hi-index-format},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-identity-headers-hi-index-format},
note = {Source note sip-identity-headers-hi-index-format, checked 2026-10-02}
}