pbxnsip – Remote Party/Privacy Indication: P-Asserted-Identity and P-Preferred-Identity
RFC 3325 describes a way to represent the display number and network number. In most cases, it makes sense to use the P-Asserted-Identity header. In this case, the From header in the INVITE represents the display number, while the P-Asserted-Identity header has the network number. A similar representation can be done with the P-Preferred-Identity header. The PBX only changes the name of the header from P-Asserted-Identity to P-Preferred-Identity.
