Hi I noticed that in the normal flow of invite message, there is a message 407 in between. UA1 ---------INVITE ----------> AST1 <--------407-------------- ----------ACK------------> ----------INVITE-----------> <------Trying-------------- There is a problem if 407 exists between asterisks. UA1 UA2 | | AST1 ---------INVITE ----------> AST2 <--------407-------------- ----------ACK------------> (AST1 don't know how to response the message 407 and the call will drop) I want to remove such authentication between asterisk such that call can flow between them. Is it possible to do that? How? Thanks!