A proxy in the Trust Domain that receives P-Preferred-Identity from a user agent removes that header from any message it forwards, using it only as a hint for which identity to assert.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- P-Preferred-Identity
- Deployment
- multi-tenant, on-premises
- Region
- not restricted
- Release range
- RFC 3325
- Checked
- 2026-10-02
Sources
- RFC 3325: Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks — IETF / RFC Editor · tier 1 standards and regulators · Section 6 (Proxy behavior) and Section 9.2
Cite this note
APA
WarmTransfer. (2026, October 2). SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-ppi-removed-by-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-identity-headers-ppi-removed-by-proxy
BibTeX
@misc{warmtransfer-claim-sip-identity-headers-ppi-removed-by-proxy,
title = {SIP identity headers: P-Asserted-Identity and Diversion and History-Info: source note sip-identity-headers-ppi-removed-by-proxy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-identity-headers-ppi-removed-by-proxy},
note = {Source note sip-identity-headers-ppi-removed-by-proxy, checked 2026-10-02}
}