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A filtered header of a call in a Gateway-Gateway (GW-GW) scenario is not passed to the egress gateway if that header is known to the egress gateway, even if the "unknown" header transparency is enabled.
 
For example, the P-Asserted-Identity (PAI) header is not passed transparently if the following events occur simultaneously:
  • the PAI is filtered on the ingress
  • the "unknown" header transparency is enabled on the egress gateway
  • the PAI header is known to the egress gateway.
 
To pass the PAI header transparently on the egress gateway, enable transparency for the PAI header through a SIP Filter Profile.