You are talking about VoIP, the previous poster was refering to analog voice.

An adsl filter puts the voice in a mostly unused part the spectrum, with a 
sdsl connection, the area that was unused (under 4mhz IIRC) is not used for 
the same speed for uploads.

Adsl still allows analog voice to work on the same copper pair, sdsl does not 
leave enough bandwidth on the line for voice to co-exist with the data 
signals.

On 22 May 2006 at 14:38, Mike Miller wrote:

> So why can't the voice channel be integrated into the modem? All 
> our analog phones at work have been replaced by Cisco voip so 
> all the voice communication is carried on the data network.

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