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------------>
...
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