I had a similar situation that I resolved using nprev2 package and nagios, I sent a ping from the pfsense box to my sip providers ip, we charted the latency and found that it was in the neighborhood of 80ms on average, that prompted us to switch up to a different ISP at the location and once that was in place we got times down to about 25ms and the problem essentially went away. Not certain that this is your problem, but I've been using this for a while and monitoring, once the times get up to 50ms or so, my connections to asterisk start having issues.
You also don't have to run tcpdump on pfsense itself ( I wouldn't do it on the alix in production ) but you could put something between the pbx box or if its beefy enough just run tcpdump on it to get the info you need. Jim On Tue, Feb 5, 2013 at 2:15 PM, Noam Birnbaum <[email protected]>wrote: > Hi folks, > > We have deployed the same configuration to about 3 different sites that > are all having the same problem. > > They each have an Asterisk-based PBX behind a pfSense router (by Netgate) > running 2.0.1. [For some reason Netgate hasn't made 2.1 available yet.] > > Fairly frequently, but seemingly unpredictably -- like, a dozen times per > day -- an incoming call will simply not go through; it'll drop before the > caller hears a dialtone or anything. I spoke to the SIP trunk provider and > they say they are sending SIP requests but receiving no response. The PBX > itself has no record of any SIP requests coming in, which leads me to > believe that for some reason the pfSense is dropping those incoming SIP > requests. > > Port forwarding for SIP and RTP are set up just fine; the majority of > calls work without trouble. Actually, one symptom seems to be that, after > one or two calls in a row dropping as I've described, suddenly things will > start working again and the problem won't be reproducible until it happens > again in an hour or two. > > I would run a packet capture on the pfSense except that, since the problem > is intermittent and it's running on an Alix board, I don't have enough disk > space to save hours and hours of packet captures! > > Any ideas how else to troubleshoot? > > Thanks! > noam > > Noam Birnbaum > Mac Daddy > http://www.maccentricsolutions.com > 877.luv.macs x666 > tweet @noamb > > Tech support —> 877.luv.macs or [email protected] > > > _______________________________________________ > List mailing list > [email protected] > http://lists.pfsense.org/mailman/listinfo/list > >
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