$url = 'http://151.104.234.14/voipadmin/security_chk';
$ua = new LWP::UserAgent;
$res = $ua->request(POST $url,
       Content => [ Submit => 'Submit',
                    user => 'admin',
                    passwd => 'password'
                  ]
        );

##</code><code>##

--------- 1st frame POST request -----------
HTTP: POST Request (from client using port 34746)
HTTP: Request Method = POST
HTTP: Uniform ResourceIdentifier=/voipadmin/security_chk
HTTP: Protocol Version = HTTP/1.1
HTTP: Connection = Keep-Alive
HTTP: Host = 151.104.234.14
HTTP: User-Agent = libwww-perl/5.65
HTTP: Content-Length = 35
HTTP: Content-Type = application/x-www-form-urlencoded


--------- 2nd frame POST request -----------
HTTP: Submit=Submit&j_username=admin&j_password=password Request (from client using p
HTTP: Request Method = Submit=Submit&user=admin&passwd=password
----------------------------------------------------