asterisk users - Mar 2007 - One way intermittent static to PSTN

We are having intermittent problems where the person we call reports
static when we place an outgoing PSTN call.  Only the person called
hears static, to us the conversation sounds fine.  Never happens on
inbound calls.  It doesn't matter what channel you call from (IAX, SIP,
or Zap).  We have a Sangoma A108D with hardware echo cancellation with 2
PRIs to Level3 and 2 PRIs to a Nortel Option 61c and then several IAX
trunks running into this box as well.  Box is HP DL 385 G2.  I've ruled
out bad cables, bad port on sangoma and bad port at Level3 rack.  When
under load and while the problem is occurring zttest is never less than
99.987793 and is usually 100.  Nothing showing up in any logs anywhere.
Not sure it is related, but I'm noticing a very loud click when an
incoming or outgoing call is initiated that I don't remember in the
past.
 
I'm stumped.  Anyone ever experience this?  Suggestions for further
trouble shooting?
 
Thanks,
Jeremy
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That's a new one. I've seen that on lines when using a card without echo
cancellers or LEC T1's. Never with AT&T T1's. Make sure you have the
newest
firmware on your Sangoma card, then try swapping it out. If you have access
to a hammer, it might prove worthwhile to hook it up and run a MOS score on
the line itself. If it comes up low, then you escalate it with the carrier.

 

Good luck. That's an interesting one.

--------------------------------------------------
Salvatore Giudice
Salvatore.Giudice@VoIPSecurityTraining.com

VoIP Security Training, LLC
http://VoIPSecurityTraining.com

848 N. Rainbow Blvd. #1676
Las Vegas, NV 89107
Phone: (702) 979-2906
Fax: (212) 279-2906

 

From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Porier, Jeremy
M.
Sent: Friday, March 30, 2007 12:39 PM
To: asterisk-users@lists.digium.com
Subject: [asterisk-users] One way intermittent static to PSTN

 

We are having intermittent problems where the person we call reports static
when we place an outgoing PSTN call.  Only the person called hears static,
to us the conversation sounds fine.  Never happens on inbound calls.  It
doesn't matter what channel you call from (IAX, SIP, or Zap).  We have a
Sangoma A108D with hardware echo cancellation with 2 PRIs to Level3 and 2
PRIs to a Nortel Option 61c and then several IAX trunks running into this
box as well.  Box is HP DL 385 G2.  I've ruled out bad cables, bad port on
sangoma and bad port at Level3 rack.  When under load and while the problem
is occurring zttest is never less than 99.987793 and is usually 100.
Nothing showing up in any logs anywhere.  Not sure it is related, but I'm
noticing a very loud click when an incoming or outgoing call is initiated
that I don't remember in the past.

 

I'm stumped.  Anyone ever experience this?  Suggestions for further trouble
shooting?

 

Thanks,

Jeremy

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