[Serusers] How to handle ACK after stateless replies?

[Klaus Darilion]

Hi!

If the proxy replies stateless, how should the proxy handle the incoming 
ACK request?

e.g. an INVITE to an offline user:

if (!lookup("location")) {
    sl_send_reply("404", "Not Found");
    break;
}

The SIP client will respond with ACK to the 404 response. How shall I 
handle this ACK - just ignoring it?

BTW: Is it allowed to send stateless replies on existing transactions?
e.g:
t_newtran();
...
sl_send_reply(..);

thanks,
Klaus