Re: Comcast Telephone Service????

["news.comcast.net" <acoutinhobass@xxxxxxxxxxx>]

>>Almost every ATA device's CODEC can handle DTMF (touch-tine) signalling.
>>Becaue some alarm transmission formats employ DTMF, these
>>may be better suited for use with VoIP service than others, especially
>>pulse formats.  NBo guarranty here that some particular unit
>>will work.  You just have to experiment.
>
> Thanks for the info on silence suppression and echo cancellation.  Do you
> know whether these settings can be controlled by user programming, or
> whether the VOIP provider has to do it?  The information I read said that
> these two settings often cause problems for fax machines and modems trying
> to transmit over VOIP.  Presumably, that also includes alarm panels that
> use modem formats.

It varies from device to device.  My ATA device (which went bad so I'm
awaiting a replacement) is configurable over TCP/IP.  Just about everything
in it can be changed.  I sent it back so I don't have the model number but
when it comes in I'll let you know.   As I recall it was not expensive.

> Although codecs seem to be designed to handle DTMF signalling, that is
> apparently a different issue than end-to-end DTMF transmission.  From what
> I gather, the basic 8 bit codec can handle DTMF signals from a touch-tone
> phone, but those digits are converted into digital data and sent out as
> part of the signalling protocol.  By contrast, a DTMF device like a
> Contact
> ID dialer wants to dial the number (supposedly, not a problem for VOIP)
> and
> then transmit touch-tones end-to-end (which seems to be a problem for the
> 8
> bit codecs).  If true, this should be indicated at the digital receiver by
> transmission errors, rather than a failure to connect at all.  I don't
> know
> whether codecs are even designed to support pulse dialing; I suspect not.

TTBOMK, none of them are intended for DACT pulse data (I assume that's what
you meant rather than dialing).

> I am the first to admit my knowledge of this subject is extremely limited,
> so I encourage anyone with good VOIP technical knowledge to correct and
> elaborate.

Mine too, but I've had to study it a bit to learn what I need for my own
offices here and in Brazil.  WHat I do know is that it can be a royal PITA
trying to figure out what's wrong when it fails.  I'm working with some very
knowledgeable techs who've been a real blessing in helping diagnose and
correct things for us.  Unfortunately, they're not exactly fast to reply
when I ask for assistance.  IME, that is still bettter than fast but dumb.
:^)

> - badenov

Goodenov

--

Regards,
Robert L Bass

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www.BassBurglarAlarms.com
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