Mitch Thompson wrote:
I'm looking for some help from any Asterisk "heavy" who might be doing
something similar to what I'm trying to do...
Background:
I work for a research lab, testing telephony products and tools.
Historically, we used Ameritec Crescendos and Fortissimos to act as
load generators and call "sinks" when testing equipment. However, the
equipment we are testing gets more and more complex, and the scripted
scenarios the Ameritecs give have become a limiting factor for
testing. Therefore, Asterisk was chosen as a possible solution (we're
a cheap lab).
I've been learning Asterisk as I go, but I've learned a lot. Here's
the basic scenario:
We are using an Asterisk (AAH 2.8, specifically) to sink calls. I do
this by taking the ${EXTEN} and breaking it down by sections until I
get to the last 4 digits (i.e., 2105551212). Once I get to the
4-digit extension, I am trying to set a flag, or semaphore, to do
Busy/Idle testing. Here is my extensions_custom.conf fragment:
[SATX_555_Extensions]
exten => 1212,1,System(cat /tmp/{orig_num}) ; ${orig_num} is set at
the beginning of [from-trunk-custom] to the full dialed digits in
${EXTEN}, before I break it down.
exten => 1212,n,Busy(); if the file exists, someone else has already
called this number, return busy
exten => 1212,102,System(echo ${UNIQUEID} > /tmp/${orig_num}) ;
basically, create a file in /tmp whose name is the full number from
the beginning. In this case, the full
; filename would be /tmp/2105551212. I don't really care about the
contents, though.
exten => 1212,103, Goto(Idle,1) ; from here, we jump to a new
extension called Idle, where we do a Random to decide whether to
simulate no one home (ring no answer) or
; we send ring for
about 10 seconds, then Answer() and play some .wav files, then
hangup. The last thing we do in either case is to delete
; the
/tmp/${orig_num} file.
The above code works very well at low call volumes. However, I'm
running into race conditions at high call volumes where several calls
are getting through the test in priority 1 before the file is created
in priority 102 (n+101).
I've tried to implement semaphores by using both local and global
variables, but it doesn't seem to work.
My ultimate question: Is anyone doing something similar, and what did
you do to implement the busy/idle.
I appreciate any help anyone can offer.
Mitch Thompson
I wanted to follow-up with the solution I came up with, thanks to
excellent feedback from this group, and Trevor Peirce in particular.
Our fix action was a blending of my solution (above) and Trevor's
suggestion to stop using System() calls and use the DB directive. We
ended up with something like this:
exten => 1212,1,GotoIf(${DB_EXISTS(busy/${orig_num})}?busy:idle)
exten => 1212,n(busy),Busy()
exten => 1212,n(idle),Set(DB(busy/${orig_num})=${CALLERID(num)})
exten => 1212,n,Macro(disposition,$(orig_num}) ; Call a macro, pass
along the original CdPN, and do something.
In the disposition macro, we have this:
[macro-disposition]
exten => s,1,Set(orig_num=${arg1})
exten => s,n,Random(25:s-rna,1)
exten => s,n,Ringing()
exten => s,n,Wait(6)
exten => s,n,Answer()
exten => s,n,Wait(1)
exten => s,n,Playback(lots-o-monkeys)
exten => s,n,Hangup()
exten => s-rna,1,Ringing()
exten => s-rna,n,Wait()
exten => s-rna,n,Hangup
exten => h,1,DBDel(busy/${orig_num})
The above gives us a very simplistic "coin-toss" as to whether to answer
the phone or not.
With the above dialplan, we have successfully dialed one number with
eight (8) T-1 PRIs worth of calls simultaneously and only have 1 answer
(the remaining 183 calls were shown as Busy on the Fortissimo). This
was repeatable over a 2 hour period. I'm sure we will have calls slip
through, but for now we are satisfied.
Trevor, thanks again. I learned about the DB application that day.
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