[asterisk-users] Occasional call from "asterisk"

[Cary Fitch]

We were getting "a lot" of those. We installed IPTables with blocking of
everything outside of North America and they all but vanished.

No direct evidence, but a pretty good empirical guess that they were related
to hackers trying to get paths to the US.

CF

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Brian Henning
Sent: Thursday, April 07, 2011 4:54 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: [asterisk-users] Occasional call from "asterisk"

Hi,

Now and then our SIP phones ring with "asterisk" showing as the caller-ID.
Upon picking up the receiver, there is about five seconds of silence and
then the channel is closed (hangup).  Can anyone offer some insight?  Here's
relevant snippets from my extensions.conf and Master.csv log:

This line shows up in Master.csv:

"","","1-NOANSWER","inbound","","DAHDI/1-1","SIP/505-00000150","Dial","SIP/5
01&SIP/502&SIP/503&SIP/504&SIP/505&SIP/506,10,tTgr","2011-04-07
21:37:05","2011-04-07 21:37:16","2011-04-07
21:37:21",16,5,"ANSWERED","DOCUMENTATION","1302212225.444",""

Here's [inbound] from extensions.conf:
[inbound]
exten => s,1,Answer
exten => s,n,Ringing
exten => s,n,Set(CALLERID(num),9${CALLERID(num)})
exten => s,n,Dial(SIP/504&SIP/506,5,tTgr)
exten => s,n,Goto(1-${DIALSTATUS},1)
exten => 1-ANSWER,1,Hangup
exten =>
_1-.,1,Dial(SIP/501&SIP/502&SIP/503&SIP/504&SIP/505&SIP/506,10,tTgr)
exten => _1-.,n,Goto(2-${DIALSTATUS},1)
exten => 2-ANSWER,1,Hangup
exten => _2-.,1,Voicemail(499 at default,u)
exten => _2-.,2,Hangup

The idea is that first 504 and 506 ring, then if neither of them answer,
everyone rings.  Works great most of the time.

I have a hunch that maybe this happens if the inbound caller hangs up while
the first Dial() is ringing, but I would've expected to see the first Dial
(to 504 and 506) show up in the Master.csv log, and it's not there.  (The
preceding line of the log is a call from almost an hour earlier).  In that
case though I'd expect to see "1-CANCEL" in the log instead.  Perhaps if the
caller happens to hang up right between the two Dial() commands?..

As an aside, the Set(CALLERID...) bit doesn't work.  The idea was to prepend
a 9 so that a SIP user could use the "redial" feature of the phone's call
log to return a missed call (automatically including the 9 for outside
line).  Unfortunately the 9 does not get prepended.

Thanks in advance for any and all advice!
~Brian

------------------------------------------------------ 
          Brian Henning, Software Engineer

    /\    Pine Research Instrumentation 
   //\\   5908 Triangle Drive 
  ///\\\  Raleigh, NC 27617 
 ////\\\\ USA 
    || 
    ||    phone: 919.782.8320 
          fax:   919.782.8323 
          email: bhenning at pineinst.com 
------------------------------------------------------ 



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