"CALLERID" directive in pjsip.conf

callerid= ; CallerID information for the endpoint (default: “”)

Assuming you have set the following two headers to “yes”:
send_pai
send_rpid

And assuming the caller ID value is “ambiorixg12” this value will be present in both of these headers. You can use either header for caller ID purposes, as both headers will contain the caller ID information.

P-Asserted-Identity: “ambiorixg12” sip:12522681342@45.77.107.195

Remote-Party-ID: “ambiorixg12” sip:12522681342@45.77.107.195;party=calling;privacy=off;screen=no