[ScanIndiana] Re: Terre Haute woes.

[David L Norris]

On Tue, 2003-08-12 at 23:31, Rob Dale wrote:
> > (ProVoice is Ericsson's EDACS APCO-25 system.  Ericsson's 
> > proprietary digital system is called AEGIS.)  Although it 
> 
> Not correct... Provoice is one of Ericsson's _digital_ system. It happens to
> use the same vocoder as the one used for APCO25, but it is not APCO25 and is
> not compatible with APCO25 systems.

Well, my statement is decidedly imprecise because it's not important to
the original topic.

To elaborate slightly: ProVoice is an EDACS system which utilizes a
standard APCO-25 IMBE vocoder instead of a proprietary AEGIS vocoder. 
The modulation scheme and trunking control is not APCO-25 compliant but
the market-droids call it an "APCO-25 offering."

> and Ericsson has gone so far as to encrypt the control channel on those 
> systems so you can't even trunktrack some of them.

There are plenty of examples of ProVoice systems that are
trunk-trackable with normal EDACS scanners.  The control channel isn't
necessarily encrypted.


I've asked before and never received a response...  Has anyone
_confirmed_ that the Terre Haute ProVoice system is encrypted (either
control channel or voice) in any way?  All the reports I've seen lead to
the conclusion it is not.

-- 
 David Norris
  http://www.webaugur.com/dave/
  ICQ - 412039