[Users] multiple 487 created

[Klaus Darilion]

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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