Re: Comcast Telephone Service????

["ABLE_1" <royboynospam@xxxxxxxxxxxxx>]

Ok, more info.  At some point last night after the successful test the
customer no long had phone service.  Can you say crashed???

Today Comcast came out and determined that the modem (Motorola) was
defective and they replaced it with a Arris Model# TM402P\110.  And the
phone is working again.  Sent signals to Central Station and all OK.  Tried
to Download to my office PC and again all OK.

I Googled the model number and the .pdf spec sheet indicated that it uses
Codec G.711.  So based on the info below this is good.

I asked my customer to do some regular test for the next few weeks.

He agreed.  More info later.

Later,

Les



> It seems that transmitting touch-tones is a known problem with some VOIP
> systems, and it has to do with the "codec" being used.  The codec is the
> equipment or program that converts digital data into voice, and vice
> versa.
> Codecs based on the G.711 standard transmit touch-tones seamlessly, but
> they generate a 64kbps output.  Other codecs, such as the G.729, compress
> things down to an 8kbps data stream, which apparently raises hell with
> touch-tones.  Even when using a "full rate" codec such as the G.711, it
> helps if "echo cancellation" and "silence suppression" are turned off, but
> I have no idea who does that, or how.  The 8kbps codecs presumably cost
> less and allow more calls to fit within the same bandwidth.
>
> So, the key to determining whether an alarm system will work on a VOIP
> system may be to determine the type of codec that is used by the VOIP
> interface.  Assuming the cable companies won't tell or don't know,
> googling
> the part number might produce some useful information.
>
> - badenov
>