enum MtasChargingProfileUseUnkownAsCallingPartyAddressWhenNoPaiDT

0 - DO_NOT_USE_UNKNOWN - When this attribute is set to 0, MTAS will not include Calling-Party-Address AVP when the P-Asserted-Identity is empty in the initial INVITE.
1 - USE_UNKNOWN - When this attribute is set to 1, MTAS will use 'unknown' as the Calling-Party-Address AVP when the P-Asserted-Identity is empty in the initial INVITE.

References from:: MtasChargingProfile;

`0`	`DO_NOT_USE_UNKNOWN` When this attribute is set to 0, MTAS will not include Calling-Party-Address AVP when the P-Asserted-Identity is empty in the initial INVITE.
`1`	`USE_UNKNOWN` When this attribute is set to 1, MTAS will use 'unknown' as the Calling-Party-Address AVP when the P-Asserted-Identity is empty in the initial INVITE.