New subject: [Kamailio-Users] CANCEL and 487 Request Terminated

6 Nov 2008


      I think that's the way it should be. First it receive 487 from SBC and immediately it responds it to SBC with the ACK. Then it passes the 487 to the UAC and receive the ACK, that's all. It doesn't have to forward that last ACK to the SBC.
----- Mensaje original -----
De: Krom kyle.romulas@gmail.com
Fecha: Jueves, Noviembre 6, 2008 4:06 pm
Asunto: Re: [Kamailio-Users] CANCEL and 487 Request Terminated
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My apologies for the drawing.  Openser is receiving the 487 from the
SBC, ACKing back to the SBC and then passing the 487 to the UAC and
the the UAC ACK's back to Openser.  At which time the error occurs
because the ACK will not be forwarded since it already ACK'd for the
487 to the SBC.
-Kyle
On Thu, Nov 6, 2008 at 2:42 PM,  ingdavidcespedes@cable.net.co 
wrote:> The final 487 should go from openser to UAC, not from SBC 
to UAC. That's why the final ACK is getting lost, because it was 
allready ACK'd by openser.
...
----- Mensaje original -----
De: Krom kyle.romulas@gmail.com
Fecha: Jueves, Noviembre 6, 2008 1:18 pm
Asunto: Re: [Kamailio-Users] CANCEL and 487 Request Terminated
...
Klaus,
Some additional information.  After viewing a trace I can see
that the
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...
error is being generated from the last ACK received from the UAC.
OpenSER/Kamailio is ACK'ing to the 487 from the PSTN provider
and then
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relaying the 487 to the UAC which in turn ACK's back.  It is the
last>> ACK from the UAC that is getting the error on t_relay.  I 
can assume
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...
because the ACK to the 487 was already sent by OpenSER/Kamailio
to the
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...
PSTN upon receiving the initial 487.  Something in the script I can
change to prevent this or just ignore the error and move on.  :-)
UAC       OSER         SBC
CANCEL --->  |
                CANCEL --->  |


<---   200 canceling
                | <---    200 OK

                | <---    487 Request Terminated

                ACK --->


<---    487 Reqest Terminated
ACK   --->      |
Regards,
-Kyle
On Thu, Nov 6, 2008 at 9:05 AM, Krom kyle.romulas@gmail.com
wrote:>> > Klaus,
...
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...
Thank you for the reply and the link.  The link help in
checking my
...
...
...
work.  My script is very simple and even checking against the
compiled> scripted from sipwise.com the error persists.
...
Here is my CANCEL and ACK handling.
 if(is_method("CANCEL") || is_method("ACK")) {
   if(t_check_trans()) {
     if(!t_relay()) sl_reply_error();
   }
   exit;
 }
Here is my route block for PSTN calls.
route[4]
{
 if (!load_gws()) {
   sl_send_reply("500", "Server Internal Error");
   exit;
 }
 if (!next_gw()) {
   sl_send_reply("503", "Service Unavailable");
   exit;
 }
 t_on_failure("2");
 t_relay("udp:<IPADDR>:5060");  # Relay to the Session Boarder
Controller>
...
exit;
}
Here is my failure route.
failure_route[2]
{
if(t_check_status("408|500|503")) {
   if (!next_gw()) {
     t_reply("503", "Service Unavailable");
     exit;
   }
   t_on_failure("2");
   t_relay("udp:<IPADDR>:5060"); # Relay to the Session Boarder
Controller>  }
...
exit;
}
Any thoughts or errors you see?
Regards.
On Thu, Nov 6, 2008 at 3:56 AM, Klaus Darilion
klaus.mailinglists@pernau.at wrote:
...
looks like the ACK is miss-routed.
Usually calling t_relay() for ACK is sufficient (take a look at
the config
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file generated with sipwise.com wizard for correct CANCEL/ACK
handling.>>
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regards
klaus
Krom schrieb:
...
Et al,
Version: openser-1.1.1-notls
I am receiving the following after calling t_relay within the
default>>> route block.
...
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ERROR: t_newtran: transaction already in process 0xb0139638
WARNING:sl:sl_send_reply: I won't send a reply for ACK!!
WARNING: script writer didn't release transaction
This is happening when a downstream UAC dials outbound to the
PSTN and
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then terminates the call prior to the far ending answering.
UAC send a CANCEL to the proxy, the proxy responds to the UAC
with a
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'200 canceling' and forwards the CANCEL to the PSTN provider.
The PSTN provider sends 487 Request Terminated to the proxy and
the>>> proxy sends it on to the UAC.  UAC responds with an ACK to
the proxy.
...
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...
Is this an issue?  How do I handle this dialog withou
getting the
...
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...
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t_relay error message?
--
Thanks,
-- Kyle
--
Thanks,
-- Kyle

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-- 
Thanks,
-- Kyle