[Asterisk-Users] Can I use Asterisk for a modified Hoot andHoller?

[Race Vanderdecken]

Hmmm,

	Hoot and Holler, hoot-n-holler, ARD: Automatic Ring Down, Hot
line and Private Line Automated Ringdown (PLAR)

	You should think about VoIP via Asterisk.

Here is a quick search result on it
http://lists.digium.com/pipermail/asterisk-users/2003-March/008936.html

But not much else.

 I am looking at pre-dial on the cisco 7960 or the snom 200's I have. 

This might be a good thing to add to sip. Just need to get the phone to
ping Asterisk when it goes off hook. A few changes to the sip C code to
make it dial an extension/context.

If someone knows how to get a voip phone to pre-dail then the SIP
changes are not that hard.

Race "The Tyrant" Vanderdecken

Looking at this issue I stole/lifted this from a hoot-n-holler company.

"An Auto-Ring Down is a leased voice circuit that connects two single
endpoints together. When either telephone handset is taken off-hook, the
remote telephone automatically rings. This application is used most
frequently for brokerage firms, banks, Wall Street firms and
applications that require immediate verbal responses. Since ARDs and
Hoot'n'Hollers are popular with Wall Street and Recycling Companies,
(name of company removed here) has specialized in both types of
circuits. 

This type of voice-grade analog circuit is considered a specialty
circuit in that the Bell codes for signaling on both ends are not coded
the same on each side, as are most other types of circuits. This is
called a 2-state signaling scheme, based upon the use of the "A-Bit".
Like many other voice-grade analog circuits, it can be ordered either as
a 2 or 4 wire connection based on the requirement of the customer's
terminating equipment. If any of the segments of the tail circuits into
the customer's premise are in excess of 6 miles, the circuit should be
ordered up as a 4 wire. This is followed with a hybrid station pack at
the customer site to break it back down to 2 wires for their equipment."


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rich
Adamson
Sent: Monday, April 18, 2005 1:12 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Can I use Asterisk for a modified Hoot
andHoller?

> Hello wonderful asterisk users list.  
> 
> I have some energy traders that are currently using 2 wire
> hoot-n-hollers (squawk box, always open direct line) to different
> trading floors throughout the country.  Each "box" has one
hoot-n-holler
> line.  I would like to make these boxes IP based by connecting the 4
> lines to a TDM400 with 4 fxo modules, providing SIP or IAX extensions
> for each hoot line and giving my clients a softclient on their
desktop.
> Will it work?  Is it reliable?  Is it the best way?
 
The probability of making that work with a TDM card is rather low.

The primary reason is the TDM card (and drivers) are oriented around
ringing come in, some action performed (eg, dialplan), and aswering
the call. Hoot-n-holler circuits don't have those same functions.

In most cases that I'm familiar with, the actual circuit used for
these is four-wire (not 2-wire) and the TDM does not have a four-wire
interface.

Could someone modify the drivers to do that? High probability, but 
that isn't going to be an easy task for the uninitiated.


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