Establishing Audio/Video Telephony in PSTN Dial-Up network.

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2 total messages Started by S S Robert Sun, 04 May 2003 17:43

#20

Author: S S Robert
Date: Sun, 04 May 2003 17:43

21 lines
1872 bytes

How can I establish Voice & Video telephony using a Dial-Up PSTN connection
(such as the connection we make using Hyper Terminal of Windows) ? What is
the software required for that and where can I get it ?
Also to establish Video telephony with that communication/telephony
software, what type of camera I would require? would the contemporary Webcam
work ? Or I'll require any special type of Camera/ Video capture device for
that Software?
Please clarify in details.

Also, with the help of contemporary Webcam, is it possible to record a video
in a file? (what is the possible format ?  .mpeg or others......??)

I am using Windows 98 as my O/S. My modem is "Rockwell Data+Fax+Voice V.90 &
K56flex" type. My processor is Cyrix MII.

I think its a interesting project, lets help each other in it !

Sincerely
Sanjoy
IETE
India

Re: Establishing Audio/Video Telephony in PSTN Dial-Up network.

#21

Author: David W.E. Roberts
Date: Mon, 05 May 2003 16:48

54 lines
3283 bytes

"S S Robert" <dontspam@dont.com> wrote in message
news:b93jkf$eqili$1@ID-100940.news.dfncis.de...
> How can I establish Voice & Video telephony using a Dial-Up PSTN
connection
> (such as the connection we make using Hyper Terminal of Windows) ? What is
> the software required for that and where can I get it ?
> Also to establish Video telephony with that communication/telephony
> software, what type of camera I would require? would the contemporary
Webcam
> work ? Or I'll require any special type of Camera/ Video capture device
for
> that Software?
> Please clarify in details.
>
> Also, with the help of contemporary Webcam, is it possible to record a
video
> in a file? (what is the possible format ?  .mpeg or others......??)
>
> I am using Windows 98 as my O/S. My modem is "Rockwell Data+Fax+Voice V.90
&
> K56flex" type. My processor is Cyrix MII.
>
> I think its a interesting project, lets help each other in it !
>
> Sincerely
> Sanjoy
> IETE
> India

Sanjoy,
I think you may be a little optimistic here.
Video phones normally require an ISDN line with128k for a jerky video and
acceptable voice; you need 512k+ for a really acceptable connection.
Granted that standard UK telephone lines can carry two voice lines (so BT
will DACS a line to split it into 2, reducing modem bandwidth) you will
still have problems getting an acceptable video stream down the 50% of the
line not needed for acceptable voice transmision.
Calculate the size of the image you wish to send, and the number of images
per second you wish to send, and that will give you an idea of the bandwidth
required.
As to software and interworking, most PCs will support TCP/IP over PPP on a
dial up link - this is how most dial up PCs connect to ISPs - so any
standard webcam and conferencing software (such as NetMeeting) should
interwork between two PCs once they are networked together. There should be
no more problem than working between two PCs on the same LAN.

To reiterate - your problem is not hardware or software, but the choice of a
dial up link.

For information on webcams, try Google :-)

HTH
Dave R

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