OT: Hylafax & digital DID

[Jay R. Ashworth]

On Mon, Aug 09, 2004 at 03:27:09PM -0400, Joe Chasan wrote:
> On Mon, Aug 09, 2004 at 01:32:17PM -0400, Jay R. Ashworth wrote:
> > On Mon, Aug 09, 2004 at 12:37:48PM -0400, Joe Chasan wrote:
> > > what digital to analog converters are you referring to?  from what
> > > i've learned, there are big differences in the way they work - the
> > > multitech's expect, as analog DID, to provide voltage to line,
> > > something around 48V, whereas in digital, the CO provides the voltage.
> > > Is this some specialty converter?
> > > 
> > > i know i can plug an single line phone in and make it ring on demand,
> > > but i don't think the DID DTMF would get passed through in such a
> > > situation. 
> > 
> > I believe that Bill is referring to boxes like the Adtrans, which can
> > take DTMF DID on a t-span and convert it to CNID so an analog modem can
> > pick it off.
> 
> Adtran doesn't have anything specific for this that i can find -
> remember, i need the DTMF tones passed _after_ off-hook.  the best i
> can think to do with adtran is to put some sort of device before the t-1
> switch and convert it to analog there, but thats no cheap adaptor and also
> assumes advanced knowledge of which channel's the incoming call is coming
> in on which i don't know that I have or who to talk to at telco to even
> ask.  it also complicates things if i wanted dial-in and dial-out on
> it.

I don't, actually, think you do, Joe.  Even with DTMF DID, the digits
are usually passed, TTBOMK, *before* the wink acknowledge; that is, the
trunk is not actually off hook yet, because your terminal equipment
doesn't ack the call until it gets the number of DID digits it's
expecting.

I could be wrong.

I believe Faxguy has done this somewhere; I expect he'll chimiin in if
I'm right.

What sort of terminal equipment *are* you terminating the span into?
Your PBX, as a couple other posters noted, may have some facility for
extending DID to a "virtual" group destination and delivering it as
CNID.  If you can't find that out about your switch, get me the model
and software rev; I Have Contacts<tm>.

Cheers,
-- jra
-- 
Jay R. Ashworth                                                jra at baylink.com
Designer                          Baylink                             RFC 2100
Ashworth & Associates        The Things I Think                        '87 e24
St Petersburg FL USA      http://baylink.pitas.com             +1 727 647 1274

	"You know: I'm a fan of photosynthesis as much as the next guy,
	but if God merely wanted us to smell the flowers, he wouldn't 
	have invented a 3GHz microprocessor and a 3D graphics board."
					-- Luke Girardi