• Pekka Pessi's avatar
    nta.c: added timer N3. · c2954bdf
    Pekka Pessi authored
    Timer N3 is used to guard against the excessive long delays when
    establishing a TCP connection. If a SIP request message is over 1300 bytes
    the stack tries to use TCP even if UDP is specified. Without N3 the
    transaction times out if the stack receives no response to TCP SYN segment
    (connection establishment request) because, e.g., a "stealth-mode" firewall
    drops the SYN segment. The "stealth-mode" firewall does not respond with a
    ICMP unreachable packet or RESET segment.
    Thanks for Michael Jerris, Johan Paul, Sami Sirkia and Jarmo Ruusiala for
    repeatedly reporting the problem.
nta.c 272 KB