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]

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