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0 - DO_NOT_USE_FROM_HEADER - When this attribute is set to 0, terminating MTAS will not include Calling-Party-Address AVP or include a Calling-Party-Address AVP with value "unknown" depending on the CM mtasChargingProfileUseUnkownAsCallingPartyAddressWhenNoPai when the P-Asserted-Identity is empty in the initial INVITE.
1 - USE_FROM_HEADER - When this attribute is set to 1, terminating MTAS will use the URI of 'From header' as the Calling-Party-Address AVP when the P-Asserted-Identity is empty in the initial INVITE.
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