testing dial up modem over VoIP

testing dial up modem over VoIP
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Subject Author Date
testing dial up modem over VoIP Chris Eilersen 12-03-2004
Posted by Chris Eilersen on December 3, 2004, 3:21 pm
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Is it possible to test a dial up modem connection using a VoIP phone? I'm
thinking that it's not as I can't seem to get a modem in the house to
handshake.

Thanks

--
-------------------------------------------
Chris Eilersen
chris@eilersens.com




home networking made easy, greater protection, less stress, introducing nm 5.0, 728x90
Posted by Seeker on December 3, 2004, 4:48 pm
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NO.

> Is it possible to test a dial up modem connection using a VoIP phone? I'm
> thinking that it's not as I can't seem to get a modem in the house to
> handshake.
>
> Thanks
>
> --
> -------------------------------------------
> Chris Eilersen
> chris@eilersens.com
>
>




Posted by stephen on December 4, 2004, 11:36 am
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> Is it possible to test a dial up modem connection using a VoIP phone? I'm
> thinking that it's not as I can't seem to get a modem in the house to
> handshake.

So IP telephony systems do support modems, but they dont use an IP phone -
the speech compression system tends to scramble the signal.

If you had a phone set to do G.711 (which is 64k of data, maybe 80k or more
with overhead) you may get somewhere, since that is the same digitisation
used in a conventional TDM pbx - and your modem has to work with that....
>
> Thanks
>
> --
> -------------------------------------------
> Chris Eilersen
> chris@eilersens.com
--
Regards

Stephen Hope - return address needs fewer xxs




Posted by on December 4, 2004, 12:18 pm
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>Is it possible to test a dial up modem connection using a VoIP phone? I'm
>thinking that it's not as I can't seem to get a modem in the house to
>handshake.

You can't use a conventional dial-up modem over any compressed VOIP line
and even G.711 uncompressed is going to be a challenge unless you've got
voice priority (802.1p/q) working end-to-end.





Posted by Mike Schumann on December 11, 2004, 6:51 pm
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I couldn't even get a modem to work thru a Sipura 3000 going from the POTS
port out the PSTN port. This is implimented in the Sipura as a VOIP
connection between the two ports inside the box.

I've completely given up on being able to connect modems via VOIP.

Mike Schumann

> Is it possible to test a dial up modem connection using a VoIP phone? I'm
> thinking that it's not as I can't seem to get a modem in the house to
> handshake.
>
> Thanks
>
> --
> -------------------------------------------
> Chris Eilersen
> chris@eilersens.com
>
>




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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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