Re: [Users] multiple 487 created - sr-users

15 Feb 2006

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

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