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RPID headers defined in https://tools.ietf.org/id/draft-ietf-sip-privacy-04.txt:


PID headers defined in https://datatracker.ietf.org/doc/html/rfc3325:


Forward RPID / Forward PAI

OP and TP have separate options: Forward RPID and Forward PAI in their settings.

The logic to pass these headers are in this order:


OP Forward RPID/PAI options tell if it is allowed to pass/forward RPID/PAI headers from OP to TPs.

If headers are passed from OP to TPs, then TP Forward RPID/PAI options tell if these headers should be passed to the TP.

If OP denies RPID/PAI header forward, then RPID/PAI headers coming from this OP will be dropped and TPs will not have any RPID/PAI headers to be forwarded.

In other words - OP makes a call that can pass over some TPs. If OP denies RPID/PAI forward, there is no difference what RPID/PAI settings are on any of the TPs for this call - these headers are already dropped by OP. Only when OP allows RPID/PAI header forward, then separate TPs RPID/PAI settings can have an impact on the result.

OP setting TP setting Result
Forward RPID: yes Forward RPID: yes RPID headers are forwarded to TP
Forward RPID: yes Forward RPID: no RPID headers are NOT forwarded to TP
Forward RPID: no Forward RPID: yes/no RPID headers are NOT forwarded to TP

Same logic applies to the PAI settings.

Change RPID/PAI Host

Change RPID/PAI Host option in the OP settings changes the IP address in the RPID/PAI headers to the Proxy server's IP address.


Incoming headers:

Remote-Party-ID: <sip:390458446594@>;privacy=off;screen=yes
P-Asserted-Identity: <sip:390458446594@;user=phone>

are changed to:

Remote-Party-ID: <sip:390458446594@>;privacy=off;screen=yes
P-Asserted-Identity: <sip:390458446594@;user=phone>

Where is the Proxy server's IP.

NOTE: if the host in the RPID/PAI header comes as a hostname, e.g some.server.com, then it will not be overwritten with the IP address.

Advanced modifications

Advanced modifications to RPID/PAI headers can be done using Transformations.