Hi Daniel, Thanks for the response. We are not using the pike module. The requests to a port are not dismissed; rather, in most cases, there is a delay in response from kamailio. Also, the delay is not restricted to any particular message request. it happens for any type of request. (register; subscribe; etc...). But those same requests, if pointed to different port, have no issues. Also, to note, I am not restarting kamailio when the issue occurs on a particular port. kamailio is kept running and pointing traffic to a non-problematic port seems fine. Karthik On Mon, May 11, 2015 at 12:41 PM, Daniel-Constantin Mierla < miconda(a)gmail.com&gt; wrote:

Our operating system is RHEL 5.9 and selinux is disabled. We had already added an xlog message at the top of the request; and the result showed that the message was being received by kamailio during the problematic-port issue. I will run your suggested commands when the problem recurs. Much appreciated regarding your help. Thanks, Karthik On Mon, May 11, 2015 at 1:47 PM, Daniel-Constantin Mierla &lt;miconda(a)gmail.com > Hello, > > what is your operating system? Do you have selinux enabled? > > Can you add an xlog() message at the top of request_route block and see if > the message is printed in syslog when you see the packet coming on the > network? This ensures that kamailio is receiving it. > > If you are familiar with gdb, when one port is not responding, do: > > kamctl ps > > See the pid of the processes listening on that port. Select one and do: > > gdb /path/to/kamailio PID > bt full > > That will show what that process is doing at that moment. Send the output > here. > > Cheers, > Daniel > > On 11/05/15 20:34, Karthik Srinivasan wrote: > > Hi Daniel, > > Thanks for the response. > > We are not using the pike module. > > The requests to a port are not dismissed; rather, in most cases, there > is a delay in response from kamailio. Also, the delay is not restricted > to any particular message request. it happens for any type of request. > (register; subscribe; etc...). > > But those same requests, if pointed to different port, have no issues. > > Also, to note, I am not restarting kamailio when the issue occurs on a > particular port. kamailio is kept running and pointing traffic to a > non-problematic port seems fine. > > Karthik > > On Mon, May 11, 2015 at 12:41 PM, Daniel-Constantin Mierla < > miconda(a)gmail.com> >> Hello, >> >> do you have pike module loaded and enabled? >> >> Are all requests to a port dismissed or just some of them? >> >> Cheers, >> Daniel >> >> On 11/05/15 19:20, Karthik Srinivasan wrote: >> >> Hi, >> >> I have encountered an issue with kamailio and am hoping someone on this >> email distro can help: >> >> Here's my setup and description of the issue: >> >> I am running kamailio version 3.1.4. >> >> I have the kamailio process bound to ports 5060, 5070, and 5090. all >> UDP. >> >> I have several client devices registering to the kamailio registrar. >> >> The issue I have encountered is this: >> >> SIP registrations to port 5070 are fine for a period of time; by fine >> I mean clients send SIP registration requests to kamailio; and kamailio >> responds promptly to the request. by period of time I mean (this could be >> somewhat random) that for10 hours; 12 hours; 1 hour; that kamailo has no >> issue processing requests. after this random time period has elapsed, >> kamailo isn't able to respond to sip registrations and other messages in >> timely manner; to the point where the clients timeout and have to resend >> their registration requests. at times, kamailio does respond to the >> requests (with a significant delay) and at other times no response is >> received by the client. the user experience is intermittent registration >> delays/failures. >> >> The same behavior is seen on port 5090. >> >> I have not encountered the issue yet on port 5060. >> >> During times when kamailio isn't able to respond timely to requests on >> a particular port, requests to other ports are responded to timely. >> >> for ex: if port 5070 encounters the issue; port 5060 and 5090 seem >> fine. meaning, I can point my client devices to 5060 or 5090 and kamailio >> processes the requests timely. >> >> I have studied a tcp dump on the server end (kamailio side) and noticed >> that the network layer shows the messages from the client to be received >> timely while kamailio is encountering this issue. which indicates to me >> that it probably isn't a network lag related issue. >> >> Something at the application layer is probably causing kamailio to not >> respond timely. >> >> Furthermore the issue resolves itself after a period of time; that is, >> kamailio begins to respond to messages timely on the problematic port. >> I haven't had a chance yet to determine exactly how long it takes to >> recover. it certainly takes some time though. at least 30 minutes; maybe >> more. >> >> I can also state that the load on the kamailio system is minimal. far >> below than what the performance metrics state it can handle. >> >> Has anyone encountered this issue where kamalio isn't responding to >> registration and other requests timely on a particular port but does so >> fine for other ports? >> >> Any help on this would be appreciated. >> >> Thanks, >> >> Karthik >> >> >> >> >> >> >> >> _______________________________________________ >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >> >> >> -- >> Daniel-Constantin Mierlahttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda >> Kamailio World Conference, May 27-29, 2015 >> Berlin, Germany - http://www.kamailioworld.com >> >> >> _______________________________________________ >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list >> sr-users(a)lists.sip-router.org >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >> >> > > -- > Daniel-Constantin Mierlahttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda > Kamailio World Conference, May 27-29, 2015 > Berlin, Germany - http://www.kamailioworld.com > >