RFC 8946 (February 2021) defines a div PASSporT so that a retargeted call can show that the original called number no longer matches the new destination, distinguishing legitimate forwarding from replayed tokens.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- Identity header
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- RFC 8946
- Checked
- 2026-10-02
Sources
- RFC 8946: Personal Assertion Token (PASSporT) Extension for Diverted Calls — IETF / RFC Editor · tier 1 standards and regulators · Section 1 (Introduction)
Cite this note
APA
WarmTransfer. (2026, October 2). SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-div-passport-purpose. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-identity-headers-div-passport-purpose
BibTeX
@misc{warmtransfer-claim-sip-identity-headers-div-passport-purpose,
title = {SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-div-passport-purpose},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-identity-headers-div-passport-purpose},
note = {Source note sip-identity-headers-div-passport-purpose, checked 2026-10-02}
}