[Asterisk-Users] Modem Over IP: solutions ?

[Carlos]

Hey jean,

I have had to deal with the same situation many times what we have come to
the conclusion is you can actully get them to work only under the 4-2
signaling that the alarm companys use.  Just about all alarms now are set to
use contact id which we have found out that we send the data ok but we don't
get a kiss back telling the alarm to silent.  Note the different between 4-2
and contact id are 4-2 basically calls and says there is a issue here.
Contact id will call and say there is an issue on the 4th floor room 410
closet.  Basically with contact id you get spacifics of the issue.  Note set
the alarm speed to as low as possible.  And in some cases the alarm comapnys
are ass's and wont change it to 4-2 because they have to re id everything.
Oh yea and when testing make sure you call the alarm company and put it in
test mode the fire dept dosnt exactly like it when the get false calls.

Carlos Alcantar
Race Technologies, Inc.
101 Haskins Way
South San Francisco, CA 94080
P: 650.246.8900
F: 650.246.8901
E: carlos at race.com
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jean-Michel
Hiver
Sent: Saturday, October 22, 2005 12:59 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion; Commercial and
Business-Oriented Asterisk Discussion
Subject: [Asterisk-Users] Modem Over IP: solutions ?

Hi,

I have a potential client who has legacy alarm systems which use modems to
transmit encoded data to a remote location through the PSTN. They wish to
replace the 'PSTN' bit with an IP link.

I am aware that it would be best if the data was transmitted directly over
IP rather than modulated and then sent on the internet, but that is not
possible because of the legacy equipment.

I was wondering if there was some specialized ATAs of some kind that would
do TDMoIP and which could be used for this purpose?

Link latency is about 300ms with no more than 10ms jitter. If you have a
solution please let me know!

Cheers,
Jean-Michel.

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