To not leave this thread forever unanswered, it turns out the above method using t_next_contacts() was working as it should be, but as every contact in the 302 redirect response was returning a 401, it tried all available contacts and then ran out of options which resulted in t_reply("408", "Request Timeout MH 2");

This was due to my lazy regex whilst debugging. "[456][0-9][0-9]"

Apologies for the noise.

On Thu, Mar 31, 2016 at 11:57 AM, Marrold <kamailio@marrold.co.uk> wrote:

I've found the following in an old thread that should help me debug, I will let the list know how I get on.

pv_printf("$var(contact)", "$xavp(contacts[0]=>uri)");
xlog ("L_NOTICE", "var(contact)=$var(contact)\r\n");

On Thu, Mar 31, 2016 at 12:46 AM, Marrold <kamailio@marrold.co.uk> wrote:
Hi all,

I am having some issues using get_redirects() from the UAC_Redirect module in conjunction with t_next_contacts from the TM Module. I've searched Google and the list but the only references I can find are several years old.

I am attempting to configure Kamailio so it if receives a 3XX redirect message, it will store the Contacts it contains, and attempt them in 'Q' parameter order.

So for the Contact below-

Contact: <sip:10.0.97.21:5060>;q=0.2,<sip:5.29.13.139:5060>;q=0.5.

I want Kamailio to try 5.29.13.139, and if that times out, or is rejected in someway, try 10.0.97.21.

If I use t_relay rather than t_next_contacts, kamailio branches the calls and relays them in parallel regardless of Q value - this is not what I want.

If I use t_next_contacts, it attempts 5.29.13.139 which is rejected with a 401, but it doesn't attempt 5.29.13.139 and responds "408", "Request Timeout MH 2"

Relevant script section is below, has anyone been able to get this working?

failure_route[302] {

if (t_check_status("302")){
xlog("L_ALERT","Failure Route: 302\n$mb");

get_redirects("*");

if (!t_load_contacts()) {
send_reply("500", "Server Internal Error - Cannot load contacts MH");
exit;
};

if (!t_next_contacts()) {
t_reply("408", "Request Timeout MH");
} else {
t_on_failure("302");
t_relay();
exit;
};
} else if (t_check_status("[456][0-9][0-9]")){

if (!t_next_contacts()) {
t_reply("408", "Request Timeout MH 2");
} else {
t_on_failure("302");
t_relay();
exit;
}
}
}

Thanks,

Matthew