Module: kamailio Branch: master Commit: e99bfd2368c28e920f92af9ade1c29cb2ba709da URL: https://github.com/kamailio/kamailio/commit/e99bfd2368c28e920f92af9ade1c29c… Author: Kamailio Dev <kamailio.dev(a)kamailio.org> Committer: Kamailio Dev <kamailio.dev(a)kamailio.org> Date: 2019-12-17T19:31:12+01:00 modules: readme files regenerated - tm ... [skip ci] --- Modified: src/modules/tm/README --- Diff: https://github.com/kamailio/kamailio/commit/e99bfd2368c28e920f92af9ade1c29c… Patch: https://github.com/kamailio/kamailio/commit/e99bfd2368c28e920f92af9ade1c29c… --- diff --git a/src/modules/tm/README b/src/modules/tm/README index 4b23eacb58..71ae54e48e 100644 --- a/src/modules/tm/README +++ b/src/modules/tm/README @@ -117,7 +117,7 @@ Daniel-Constantin Mierla 4.36. t_lookup_cancel([1]) 4.37. t_drop_replies([mode]) 4.38. t_save_lumps() - 4.39. t_load_contacts() + 4.39. t_load_contacts([mode]) 4.40. t_next_contacts() 4.41. t_next_contact_flow() 4.42. t_check_status(re) @@ -372,7 +372,7 @@ Chapter 1. Admin Guide 4.36. t_lookup_cancel([1]) 4.37. t_drop_replies([mode]) 4.38. t_save_lumps() - 4.39. t_load_contacts() + 4.39. t_load_contacts([mode]) 4.40. t_next_contacts() 4.41. t_next_contact_flow() 4.42. t_check_status(re) @@ -1724,7 +1724,7 @@ modparam("tm", "rich_redirect", 3) 4.36. t_lookup_cancel([1]) 4.37. t_drop_replies([mode]) 4.38. t_save_lumps() - 4.39. t_load_contacts() + 4.39. t_load_contacts([mode]) 4.40. t_next_contacts() 4.41. t_next_contact_flow() 4.42. t_check_status(re) @@ -2473,7 +2473,7 @@ failure_route[1] { t_relay(); } -4.39. t_load_contacts() +4.39. t_load_contacts([mode]) This is the first of the three functions that can be used to implement serial/parallel forking based on q and +sip.instance values of @@ -2489,18 +2489,33 @@ failure_route[1] { nothing. If the current destination set contains more than one branch, the - function sorts them according to increasing value of the q parameter - and then stores the branches in reverse order into the XAVP. + function sorts them according to the algorithm selected with the 'mode' + paramenter and then stores the branches in reverse order into the XAVP. The q parameter of a branch contains a value from range 0-1.0 and it expresses relative preference of the branch among all branches in the destination set. The higher the q value the more preference the user - agent gave to the branch. Branches with higher q values will be tried - before branches with lower ones when serial forking takes place. + agent gave to the branch. The parameter 'mode' controls which type of + algorithm kamailio will apply to sort the branches based on the q + values: + + - '0' or missing: branches with higher q values will be tried before + branches with lower ones when serial forking takes place Equals q + values will result in a parallel forking. + + - '1': branches are ordered using a proportional algorithm that uses to + q value as the weight of the branch. Higher is the q value, higher is + the probability to be tried as first. Equals q values means equals + probability to be tried. Differently from the previous mode there is no + possibility to have parallel forking. Branches with q values equals to + 0 or lower are not considered by the ordering algorithm, but just added + at the end of the list as backup option if all other branches fail. + This algorithm can be useful in case of endpoints in ACTIVE-ACTIVE + configuration to load-balance the calls. After calling t_load_contacts(), function t_next_contacts() and possibly also t_next_contact_flow() need to be called one or more times - in order to retrieve the branches based on their q value. + in order to retrieve the branches based on their order. Function returns 1 if loading of contacts succeeded or there was nothing to do. In case of an error, function returns -1 (see syslog).