Hello,
 If a User agent Server or a Proxy server is authenticating an incoming
reuest, say INVITE or register , Can the server send 100 trying before
sending 401/407 Authentication required ?

100 Trying is to be sent to stop the retransmission of INVITE requests .

Suppose the server sends 401/407 first and after the authentication is
successful sends 100 trying, will there not be retransmissions of INVITE
requests ?

Thanks,
 Prabha N
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