[Asterisk-Users] GSM to ISDN or TAPI

[Storer, Darren]

Hi Chris,

from what you've described below it sounds like a Nokia device with a serial
connection to a host will provide the C&C features you need. Much as I like
IVR applications the ubiquitous GSM handset makes portable SMS access easy,
secure and the output can be stored for future reference.

With a little forethought you can design a simple protocol that can use
either a central GUI front-end or direct SMS input from an engineer's own
handset; authentication can still be performed against CLI and a PIN
contained within the SMS.

The results should be less prone to mis-keying as commands can be reviewed
before execution/transmission and the results can be sent back in writing
for subsequent reference. Another benefit with SMS is remote alarm handling
which is easier to guarantee because the messages are sent via a store and
forward system, so the recipient's handset does not have to be powered on
24x7 in order to ensure receipt of all alarms.

Both Nokia Premicell (22) and Ericsson equivalents are currently being sold
cheaply on UK eBay.

Good Luck.

Darren
--
Comgate
Telco>Internet<Broadcast

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Chris Lee
Sent: 10 June 2004 22:54
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] GSM to ISDN or TAPI


Storer, Darren wrote:
> Hi Chris,
>
> CL> Does the incoming DTMF and voice work over the serial
> CL> interface with the 22?
>
> I can't help but feel that you are going about this all the wrong way
(based
> upon the limited information you have chosen to share with us). If you
need
> to pass control information from one node to another and you have a pair
of
> Nokia 22s then why not simply send an SMS message? Maybe this is not a
good
> solution for you but until you "fill in the gaps" it's the best I can come
> up with.
> IE. Tell us a bit more about what you are trying to achieve.
>
I am going to have some remote machines which need to have adjustments
made to their settings on occasion, the most cost effective and user
friendly way I can come up with is a simple IVR system that says press 1
to set limits on flow, press two for flow status report etc.
It will use a combination of CLID and pin number to authenticate the
engineer doing the config.
So what I need is something that can take a pay as you go sim (least
cost for line rental) and accepts calls without too many problems.
As I said earlier I had a Nokia 32;
I plugged it into a windows box with USR voice modems and it would not
work at all, it only provides a dial tone when connected to select
hardware, certain phones and one or two winmodems, I could not justify
the cost of the X100p for testing based on the mixed results.
So now I am looking at finding some other method of linking the GSM to
the PBX, I like the concept of digital all the way and RS-232 "looks
like voice modem" would be great.

Hope that clears up my requirements.

Thanks for the help

Chris.
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