enum MtasFoIwInvHeaderHandlingDT

Numeric Enumeration: 0-1 (0=REMOVE, 1=KEEP)

References from:
MtasFoIw;

0
REMOVE
When this attribute is set to 0, the F-IWF invocation header value from initial INVITE is removed.
1
KEEP
When this attribute is set to 1, the F-IWF invocation header from initial INVITE is kept.