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If Experience Portal receives an INVITE with a header it does not recognize, it saves the name and value of the header in the session.connection.protocol.sip.unknownhdr session variable array.
For example, if Experience Portal receives an INVITE with the following unknown headers:
new_header: "helloworld"
another_new_header: "howareyou" Experience Portal adds the following entries to the session.connection.protocol.sip.unknownhdr array:
session.connection.protocol.sip.unknownhdr.unknownhdr[0].name = "new_header"
session.connection.protocol.sip.unknownhdr.unknownhdr[0].value = "helloworld"
session.connection.protocol.sip.unknownhdr.unknownhdr[1].name = "another_new_header"
session.connection.protocol.sip.unknownhdr.unknownhdr[1].value = "howareyou"