[asterisk-dev] wctdm 4/8/24 VMWI generation capabilities

[Alec Davis]

The 2 methods we would like to get going are generating from an FXS port the
conventional High Voltage alerting (as is mentioned in Silicon Labs AN-33)
and the seemingly proprietry Line Reversal while messages waiting, which as
it happens we have a truck load of proprietry phones, but they also do
support HV MWI.

I hadn't tested the FSK method with an intellegent analog phone, and would
have found that it already works.

I favoured the Line reversal only because the wcdtm channel driver seems to
have the beginnings of it as below already there by manipulating
'reversepolarity' module parameter, not yet sure why wctdm24xxp doesn't,
seems easy enough to get it into the wctdm24.

	if (reversepolarity)
		wc->mod[x].fxs.lasttxhook = 0x5;
	else
		wc->mod[x].fxs.lasttxhook = 0x1;
	wctdm_setreg(wc, x, 64, wc->mod[x].fxs.lasttxhook);

So the clue is to look in asterisk/channels/chan_dahdi

Thanks
Alec




-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com]On Behalf Of Doug Bailey
Sent: Thursday, 11 December 2008 10:15 a.m.
To: akohlsmith-lists at mixdown.ca; Asterisk Developers Mailing List
Subject: Re: [asterisk-dev] wctdm 4/8/24 VMWI generation capabilities



----- "Andrew Kohlsmith (lists)" <aklists at mixdown.ca> wrote:

> On December 10, 2008 04:55:02 am Alec Davis wrote:
> > I've been looking over the code for the wctdm and the wctdm24xxp
> looking
> > for clues on how to turn on the message waiting lights of various
> connected
> > analog phones.
>
> My analog phones receive MWI from my 6-year-old wctdm card without
> issue...
> Unless there is a particular kind of MWI you are looking for that
> isn't
> supported.
>
> The one phone is one of those Nortel sets that has the fancy services
> screen,
> and I was driving that with Asterisk's ADSI implementation for about
> as long
> (6 years).
>
> -A.
>
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I may be wrong but I think he is looking for neon MWI which consists of
sending a series of >94 VDC pulses out of the fxs port.  These pulses
actually provide a voltage that can turn on a neon bulb like those that
you see in your finer hotel establishements.

Currently the wctdm and wctdm24xxp drivers cannot output those signals.
Silicon Labs does have an app note (AN-33) which describes how to implement
it.  However, it is not integrated in the drivers.

The MWI currently supported via dahdi is the FSK variant in which an FSK
message is sent in ON-HOOK transfer mode when MWI state changes or
immediately
after placing the line on hook.  This mode of MWI has been there
for some time and is actually a function of chan_dahdi as opposed to the
drivers.

Doug


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