Hello, htable can be (almost) always a rescue option -- define one with auto-expire value set to the transaction lifetime, when you know that next responses should be dropped, then add an item in the htable with callid as a key (eventually callid+cseq). When you get a response, check if you have the item in htable and drop it. Cheers, Daniel On 12.03.19 16:15, Marco Capetta wrote: > Hi All, > > I started playing with async kamailio feature, in particular using > "async_route" function provided by ASYNC module > (https://www.kamailio.org/docs/modules/5.1.x/modules/async.html#async.f.asyn…). > > My scenario is the following: >  - A calls B >  - B answer the call >  - inside onreply_route[reply] I catch the 200OK message and I suspend > the transaction for X seconds. >  - after X seconds the transaction is resumed and the call continues > as expected > > Everything looks good, but I encountered an issue trying to drop reply > re-transmission messages. > > My desire is to drop all the messages received from B (basically 200OK > re-transmissions) meanwhile the transaction is suspended. > I tested "t_is_retr_async_reply" function provided by TM module > (https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_is_retr_…), > but I'm not able to get it worked as expected: >  - t_is_retr_async_reply() function can be used only inside named > 'onreply_route' (no default 'onreply_route' or standard 'reply_route') >  - drop() function, on the contrary, doesn't allow to drop 200OK > messages inside named 'onreply_route' (but only in default > 'onreply_route' or standard 'reply_route'). > > Do you have any suggestion on how I can achieve my task? > > Thank you very much for your support. > Marco > > _______________________________________________ > Kamailio (SER) - Users Mailing List > sr-users(a)lists.kamailio.org > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users