Are you intending to use `t_next_contact_flow()` rather than `t_next_contact()`? There's not enough data here to know what your contacts look like. The definition of `t_next_contact_flow()` is: If your contacts have separate +sip.instance values, then it would be expected that this would fail. Unless you know this to be the case use `t_next_contact()` in a failure route (as opposed to a branch failure route). Regards, Kaufman ________________________________ From: Benoît Panizzon via sr-users &lt;sr-users(a)lists.kamailio.org&gt; Sent: Friday, January 17, 2025 9:15 AM To: sr-users(a)lists.kamailio.org &lt;sr-users(a)lists.kamailio.org&gt; Cc: Benoît Panizzon &lt;benoit.panizzon(a)imp.ch&gt; Subject: [SR-Users] Need help with serial branching using: t_load_contacts(1) CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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.kamai… 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? -- Mit freundlichen Grüssen -Benoît Panizzon- @ HomeOffice und normal erreichbar -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.imp.ch… ______________________________________________________ __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions -- sr-users(a)lists.kamailio.org To unsubscribe send an email to sr-users-leave(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! r