[Freeswitch-users] How to generate message waiting dialtone with pots

Michael Collins msc at freeswitch.org
Tue Mar 26 03:08:30 MSK 2013


On Fri, Mar 22, 2013 at 11:02 AM, Trever L. Adams <trever.adams at gmail.com>wrote:

>  On 03/22/2013 11:40 AM, Steven Schoch wrote:
>
> On Fri, Mar 22, 2013 at 9:43 AM, Trever L. Adams <trever.adams at gmail.com>wrote:
>
>> Can FreeSWITCH generate the waivering tone?
>>
>
>  IIUC, FreeSWITCH does not generate the dialtone.  The VoIP phone will do
> that itself, and an ATA will generate it for a analog (POTS) phone.  Your
> message wasn't clear if you are using VoIP phones, or an ATA (analog
> telephone adapter) with analog phones.  A VoIP phone will "subscribe" with
> FreeSWITCH to a MWI login, and FreeSWITCH will send it a message whenever
> the number of messages waiting changes.  In response, the VoIP phone will
> light the MWI and will play a stuttering dialtone when the handset is
> picked up.
>
>  According to http://www.voip-info.org/wiki/view/MWI "...most ATA<http://www.voip-info.org/wiki/view/ATA>'s
> support stutter dial-tone."
>
>  --
> Steve
>
> Thank you Steve. I am not using an ATA. I am using opvxa1200+   e159:0001
> OpenVox A800P. So, unfortunately, I do not believe the MWI stutter tone is
> done by the hardware (DAHDI/FreeTDM). I do not believe this card can send
> the MWI light signal as stated.
>
Yes, the stutter tone or MWI indication must be done by the hardware. When
the user lifts the handset he receives dial tone from the card. That has
nothing to do with FreeSWITCH. Now, there will be some sort of
communication somewhere that lets the card know that it needs to send
stutter tone or MWI down the line, but I'm not at all an expert on that.
Fortunately we have someone who knows all about that stuff: Moy at Sangoma.
:)

Moy, can you shed some light on how the MWI and/or stutter tone work with
Dahdi and Sangoma cards?

Thanks,
MC

>
> Thank you,
> Trever
> --
> "...the measure of a man is what he will do for another man, knowing he
> will get nothing in return." -- Unknown
>
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-- 
Michael S Collins
Twitter: @mercutioviz
http://www.FreeSWITCH.org
http://www.ClueCon.com
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