Re: [Kamailio-Users] CANCEL and 487 Request Terminated

----- Mensaje original ----- De: Krom <kyle.romulas(a)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

> error is being generated from the last ACK received from the UAC. > OpenSER/Kamailio is ACK'ing to the 487 from the PSTN provider

> relaying the 487 to the UAC which in turn ACK's back. It is the

> because the ACK to the 487 was already sent by OpenSER/Kamailio

> 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 &lt;kyle.romulas(a)gmail.com&gt;

> > > > Thank you for the reply and the link. The link help in

> > 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 > > &lt;klaus.mailinglists(a)pernau.at&gt; wrote: > >> looks like the ACK is miss-routed. > >> > >> Usually calling t_relay() for ACK is sufficient (take a look at > the config > >> file generated with sipwise.com wizard for correct CANCEL/ACK > handling.>> > >> 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. > >>> 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 > >>> 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 > >>> '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. > >>> > >>> Is this an issue? How do I handle this dialog withou