[VoIP] Cnet tandem stacking

[Jayson Smith]

Hi all,
There's now a file up on my website which demonstrates the tandem stack I
made. Here are the steps:
1. Pick up any Cnet outbound phone and dial +1 349-8688. You will get a
dialtone from Lee's SXS.
2. Dial 9 from that, and you'll get a dialtone from Lee's Asterisk system.
3. Dial 622-6245 in my case, to get back to my voicemail. Since the SXS is
an analog component, Lee can't drop out of the circuit once the call is
connected, since his SXS is holding the call.
4. Leave a message, then hang up. I assume what's happening here is that
when Lee's Asterisk system sees the disconnect, it signals the SXS line to
hang up which it does, When the SXS sees the hung up line, it hangs up the
trunk back to the Asterisk system. Thus, the far end of the connection gets
to hear the click when the near end hangs up, and also the end of the SXS
hanging up. The file where I demonstrate this is here.
http://www.bluegrasspals.com/stack.wav
Jayson

----- Original Message ----- 
From: "Lee Spenadel" <lee at spenadel.com>
To: "'Jayson Smith'" <ratguy at bellsouth.net>; "'Voice Over IP Tandem for
Analog Switches'" <voip at ckts.info>
Sent: Thursday, March 22, 2007 11:22 AM
Subject: RE: [VoIP] Cnet tandem stacking


> Jayson,
>
> I've noticed the problem that you mention about not being able to break
> dialtone on my SxS.  I'm not sure yet why that is happening.  Each tone to
> pulse converter is functioning properly on the switch, so it would appear
> that something in the zap channel is not passing DTMF at that point.
>
> I have dialed into and out of my switches until all circuits have been
tied
> up (testing my all circuits busy intercept) and this is where I get the
> problem.  I curious if anyone has an idea on why this is happening.
>
> Lee
>
> -----Original Message-----
> From: voip-bounces at ckts.info [mailto:voip-bounces at ckts.info] On Behalf Of
> Jayson Smith
> Sent: Thursday, March 22, 2007 10:07 AM
> To: Voice Over IP Tandem for Analog Switches
> Subject: [VoIP] Cnet tandem stacking
>
> Hi,
> I just did an experiment where I dialed into Lee's SXS, then out to his
> Asterisk DISA, then back to my own voicemail where I left a message. When
I
> got the message, I could hear myself hanging up, then probably Lee's SXS
> hanging up too. Neat! I did try going to SXS, then to DISA, then back to
> SXS, since he does have two talk paths not reserved for coin phones, but
> although I did get a second SXS dialtone, my DTMF digits weren't getting
> through, so I couldn't get back over to Asterisk again! Talk about a
tandem
> stack! Now if only other people had analog switches with trunks to
Asterisk
> systems, we could really create some long calls, with some actual analog
> routing!
> Jayson
>
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