[TriLUG] VoIP SIP MODEM?

[David Rasch]

On Mon, Jun 28, 2004 at 08:47:24AM -0400, Alan Porter <porter at trilug.org> wrote:
> > What you are talking about is simply a codec.
> 
> It's funny, the cellular companies do the same thing.  At least, the GSM
> providers (Cingular, AT&T Wireless) do for "circuit switched data" calls.
> 
> You buy an all-digital phone, and you hook it to your PC to surf the net.
> You would think that you've got an end-to-end digital connection.
> 
> However, your ISP doesn't know anything about cell phones... they are
> expecting you to dial up using an analog modem.  So the cellular company
> routes data calls through a bank of out-dial modems!
> 
> cell phone --- tower --- switch --- modem pool ~~~ ISP modem --- internet
> 
> In Europe, the GSM providers offer a chioce between analog modems or
> ISDN, so it's possible to go all-digital.  Here in the US, many carriers
> (Sprint, Verizon, Alltell) are using the CDMA standard.  Rather than allowing
> you to call an existing ISP's modem, they simply act as the internet service
> provider themselves.  You get the all-digital connection, but then you're
> forced to use the carrier's internet service.

You can always dial up to ISDN using your cell phone, this makes it an
all-digital connection.

David
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