It's been years since I played with FXO lines but it seems to me that
if you can listen to it with an analog phone, you should be able to
patch into it (without disconnecting any existing equipment), set your
trunk (FXO) port for LS and just issue a Dial() command to that port.
Basically, it's like a trunk that you don't have to dial because the
call is already setup for you.  If I'm right, it's analogous to your
wife being on a call in the kitchen and you pick up the phone in the
living room.  The call was already in progress when you picked up in
the living room.  No need to dial.

Thoughts:
1) I don't know whether Asterisk will refuse to connect you because
it's waiting for dialtone.
2) It seems odd to use the Dial() command even though you're not
sending digits.  Maybe there's a better command but basically you want
Asterisk to go off hook on the trunk port and connect you to it.

Something like this Bix Clip connected to an RJ-12 plug should let you
join the line without interrupting the ongoing transmission (other
than maybe a click).
http://www.alphatelecom.ca/QBIX-17A.jpg

I hope that helps,

Dave

On Thu, Aug 20, 2009 at 4:25 PM, Andre
Courchesne<[email protected]> wrote:
> Still no luck. must be something like groundstart, loopstart or a shit like
> that. Testing options are a pain here cause when I cut the radio everyone
> screems and the cabs do not get the calls.
>
> This is the device that is ac tually connected to the meridian:
>        http://www.hol4g.com/ac/product.aspx?number=CPI-DR30&p=173682&sc=0
>
> The other pic I took was actually the foot pedal interface connected to the
> DR30, which is also connected to the antena equipement. Well, that is what I
> could reverse engineer so far.
>
> Quoting "Dave Donovan" <[email protected]>:
>
>> 2009/8/20 André Courchesne <[email protected]>
>>
>>> Anyone ever interfaced an asterisk server with a taxi radio system (cb)?
>>> Right no this thing is connected to a meridian fxo port and works. If i
>>> connect it to a digium fxo port it does not.
>>>
>>
>> Andre,
>>
>> I've never heard of an application quite like that except I remember
>> reading
>> (a few years ago) about some guys in rural Australia who had hooked up
>> their
>> softphone to Push To Talk (PTT) GMRS walkie-talkies to allow them to patch
>> calls to people who were away from the house.  I tried a quick Google
>> search
>> but I didn't see anything immediately that looked like the old article.
>>
>> My first thought would be to adjust the signalling.  Have you tried,
>> groundstart, loopstart and all the rest?
>>
>> Dave
>>
>
>

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