Network with full-duplex speech?

Is there a network that offers full-duplex speech, that is, the
ability to have a conversation in which both parties are speaking at
the same time and able to hear each other?

Experimentation (land-line to cell phone, not in speakerphone mode)
shows that neither Verizon nor T-Mobile does. Since one of those is
CDMA and the other GSM, I suspect no carrier offers that level of
service, but I thought I'd ask.

And if Voce does, well, I can't afford it.

"Jack Hamilton" <jfh@acm.org> wrote in message
news:as06j2dcicp0la012rok0dhmvpnjlajh2c@4ax.com...
> Is there a network that offers full-duplex speech, that is, the
> ability to have a conversation in which both parties are speaking at
> the same time and able to hear each other?
>
> Experimentation (land-line to cell phone, not in speakerphone mode)
> shows that neither Verizon nor T-Mobile does. Since one of those is
> CDMA and the other GSM, I suspect no carrier offers that level of
> service, but I thought I'd ask.

Why are you saying they are not full duplex.

>
> And if Voce does, well, I can't afford it.
>

Dana wrote:
> "Jack Hamilton" <jfh@acm.org> wrote in message
> news:as06j2dcicp0la012rok0dhmvpnjlajh2c@4ax.com...
> > Is there a network that offers full-duplex speech, that is, the
> > ability to have a conversation in which both parties are speaking at
> > the same time and able to hear each other?
> >
> > Experimentation (land-line to cell phone, not in speakerphone mode)
> > shows that neither Verizon nor T-Mobile does. Since one of those is
> > CDMA and the other GSM, I suspect no carrier offers that level of
> > service, but I thought I'd ask.
>
> Why are you saying they are not full duplex.

Because it is not possible for both parties to talk and hear each other
at the same time.

I made a very simple test. I called a landline phone from my cell
phone and put the landline handset near a radio. I then went into
another room (where I couldn't hear the radio). I could hear the radio
through the cell phone, but when I talked into the cell phone, the
incoming sound from the radio cut out. Both parties couldn't talk and
be heard simulataneously, so it's not full duplex - it's half-duplex.

I didn't test whether the radio could hear me, but that wasn't
necessary.

At 16 Oct 2006 08:22:45 -0700 Jack.F.Hamilton@gmail.com wrote:

> Because it is not possible for both parties to talk and hear each other
> at the same time.


Sounds like it may be the phones you used. I've had many arguments on
cell phones and we could both shout over each other at the same time! ;-)
>
> I made a very simple test. I called a landline phone from my cell
> phone and put the landline handset near a radio. I then went into
> another room (where I couldn't hear the radio). I could hear the radio
> through the cell phone, but when I talked into the cell phone, the
> incoming sound from the radio cut out. Both parties couldn't talk and
> be heard simulataneously, so it's not full duplex - it's half-duplex.

All I can guess is that the particular handsets you used might mute the
speaker while you talk perhaps to eliminate echo or interference, much
like speakerphones do.

> I didn't test whether the radio could hear me, but that wasn't
> necessary.

Perhaps it was! If, as I suspect, the radio could in fact"hear you" on
the landline, that would prove your _network_ is full-duplex, even if
your handset isn't.

What does often confuse people used to landlines, is that cellphones do
not produce any "local" feedback- you don't hear _yourself_ in your
phone's speaker while you talk like you do on a traditional landline phone.





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<Jack.F.Hamilton@gmail.com> wrote in message
news:1161012165.226165.228570@b28g2000cwb.googlegroups.com...
> Dana wrote:
> > "Jack Hamilton" <jfh@acm.org> wrote in message
> > news:as06j2dcicp0la012rok0dhmvpnjlajh2c@4ax.com...
> > > Is there a network that offers full-duplex speech, that is, the
> > > ability to have a conversation in which both parties are speaking at
> > > the same time and able to hear each other?
> > >
> > > Experimentation (land-line to cell phone, not in speakerphone mode)
> > > shows that neither Verizon nor T-Mobile does. Since one of those is
> > > CDMA and the other GSM, I suspect no carrier offers that level of
> > > service, but I thought I'd ask.
> >
> > Why are you saying they are not full duplex.
>
> Because it is not possible for both parties to talk and hear each other
> at the same time.

Sure it is, I do it quite a bit.
Are you aware that cellular has an uplink and a downlink, this is what gives
the phones full duplex capability.
The only carrier I would say is not full duples is Nextel with their iDEN
network.
The dispatch is not full duplex, but the phone service is.