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Hi Gang

I guess, I don't completely understand who to properly perform serial
branching.

I did try to follow the examples from:

https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.kamailio.org%2Fdocs%2Fmodules%2Fdevel%2Fmodules%2Ftm.html%23tm.f.t_next_contacts&data=05%7C02%7Cbkaufman%40bcmone.com%7C9e2ae0b2f7ed428f103f08dd370b15f0%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C638727242952699867%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=9t0EzDJSIqM9E%2BK0GjGfBnF5gpCQCKOS7qssZVyRNmc%3D&reserved=0

This is, stripped down, the relevant config used.

modparam("tm", "contacts_avp", "tm_contacts")
modparam("tm", "contact_flows_avp", "tm_contact_flows")

route[LOCATION]
{
lookup_to_dset("location", "$var(lookupuri)");

if (!t_load_contacts(1)) {
      xlog("L_ERR", "$cfg(route): ######### load_contacts failed\n");
      sl_send_reply("500", "Server Internal Error - Cannot load contacts");
      exit;
}

xlog("L_INFO", "$cfg(route): Contacts loaded: $cnt($xavp(tm_contacts))\n");

=> Confirms, there is more than one contact loaded.

if (!t_next_contacts()) {
        send_reply("480", "Not registered");
}

t_set_fr(5000,1500); # Set 5 second timeout for LAB testing to quickly try the next contact.

t_on_branch("BR_TO_CUST");
t_on_branch_failure("BR_TO_CUST_FAILURE");
exit;
}

event_route[tm:branch-failure:BR_TO_CUST_FAILURE] {
        xlog("BRANCH FAILED $T_reply_code to $rm message\n");
        t_on_branch("BR_TO_CUST");
        t_on_branch_failure("BR_TO_CUST_FAILURE");
        if (t_next_contact_flow())
        {
                xlog("BRANCH FAILED, Try Next\n");
                t_relay();
        } else {
                xlog("L_INFO", "No more flows\n");
                t_reply("408", "Branch Timeout");
                exit;
        }
}

What happens is:

INVITE is sent to the first contact, who is replying RINGING.
After 5 seconds the timeout is reached and the branch-failure route engaged.

Jan 17 15:01:15 dev-cpereg01 kamailio[3599432]: ERROR: <script>: BRANCH FAILED 408 to INVITE message
Jan 17 15:01:15 dev-cpereg01 kamailio[3599432]: INFO: <script>: No more flows
Jan 17 15:01:15 dev-cpereg01 kamailio[3599432]: CRITICAL: tm [tm.c:1554]: ki_t_reply(): w_t_reply entered in unsupported mode

To my understanding, t_next_contact_flow() should have loaded the next ds, but this does not seem to happen.

What am I missing?

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