This means that openser does not receive the ACK or is not able to match the ACK to the canceled transaction. Thus it is re-transmitting the 487.
Increas the debug level and take a look at the syslog to find out if: 1. the ACK to the 487 is received by openser 2. if it is received, check if there is a problem during handling of the ACK. (for these kind of ACKs just t_relay()). klaus On Wed, February 15, 2006 5:13, unplug said: > For the normal cancel situation. > > UA1 OPENSER UA2 > --------INVITE-----------------> > <-----------100----------------- > --------------------INVITE----------> > <---------------100------------------- > ----------CANCEL----------> > --------------CANCEL-------------> > <--------------200------------------ > <------------487------------------- > --------------ACK-----------------> > <---------487--------------- > -------------ACK------------> > > But in my case, I found that there are many 487 created from openser to UA1. The multiple 487 may cause a call drop in the following call. > Why does openser create so many 487 for UA1? How can I prevent it? > > UA1 OPENSER UA2 > --------INVITE-----------------> > <-----------100----------------- > --------------------INVITE----------> > <---------------100------------------- > ----------CANCEL----------> > --------------CANCEL-------------> > <--------------200------------------ > <------------487------------------- > --------------ACK-----------------> > <---------487--------------- > -------------ACK------------> > <---------487------------- > -------------ACK------------> > <---------487--------------- > -------------ACK------------> > <---------487------------- > -------------ACK------------> > <---------487------------- > -------------ACK------------> > <---------487------------- > -------------ACK------------> > <---------487------------- > -------------ACK------------> > ... > > _______________________________________________ > Users mailing list > [email protected] > http://openser.org/cgi-bin/mailman/listinfo/users > _______________________________________________ Users mailing list [email protected] http://openser.org/cgi-bin/mailman/listinfo/users
