UKVoIPTalk.com

"Gordon Henderson" <gordon+usenet@drogon.net> wrote in message
news:fqrjpj$1qjv$1@energise.enta.net...[color=blue]
> In article <8qSdnbgXqYPCtEzanZ2dneKdnZydnZ2d@bt.com>,
> R. Mark Clayton <nospamclayton@btinternet.com> wrote:[color=green]
>>
>>"Michael" <kj@nvb.com> wrote in message
>>news:3Rfzj.61968$os2.5833@newsfe3-win.ntli.net...[color=darkred]
>>> Folks
>>>
>>> I run a voip line on the end of a cable connection from Virgin, and I
>>> fully understand that the system works as the cable is 'always on'.
>>>[/color][/color][/color]

[color=blue][color=green]
>>It is possible to VOIP over an ISDN connection, but I never tried it. The
>>quality would probably be similar to PSTN, but not as good as raw ISDN.
>>
>>It was possible to VOIP over dial up, but as you can imagine the quality
>>would be poor.[/color]
>
> I've managed to have a successfull VoIP conversation over a shakey 33.6K
> modem connection using the GSM codec. I imagine it might have been a
> shade better using g729... Latency was a bit high (as ping times are
> over dialup), but other than that it was "usable"...
>
> If you can get both channels of the ISDN line up, then running a full
> bandwidth codec (g711) over it via SIP or IAX should't be an issue at
> all. Bit of a waste of the lines though, but if you had free Internet
> connectivity over it, it might be better than paying BT ...[/color]

If you can get both lines up it should be a lot better - radio companies
used (possibly still do) to have a way of connecting over both channels of
basic rate with a better algorithm to give mid-fi mono voice.
[color=blue]
>[color=green]
>>Perhaps someone can tell us if you can VOIP over 3G and how many channels
>>you need, bear in mind though that the network providers will
>>intentionally
>>impede this working easily.[/color]
>
> I've had a colleague call me via VoIP and a 3G connection. Bit laggy,
> but otherwise OK. Not had a chance to try myself yet. Maybe this weekend
> I'll have a play...[/color]

Good luck.
[color=blue]
>
> Gordon[/color]

R. Mark Clayton explained :[color=blue][color=green]
>> I've had a colleague call me via VoIP and a 3G connection. Bit laggy,
>> but otherwise OK. Not had a chance to try myself yet. Maybe this weekend
>> I'll have a play...[/color]
>
> Good luck.[/color]

Install Fring on a Nokia E61i which has a Vodafone 3G card in & try it
yourself.

As Gordon says, a bit laggy but surprisingly useable.

It certainly doesn't appear to be being impeded by the network.

"R. Mark Clayton" <nospamclayton@btinternet.com> wrote in
message news:8qSdnbgXqYPCtEzanZ2dneKdnZydnZ2d@bt.com

[snip]

: > It is possible to VOIP over an ISDN connection, but I
: > never tried it. The quality would probably be similar
: > to PSTN, but not as good as raw ISDN.

Germany uses VoIP over ISDN, it works fine. Why BT can't/won't do it is
beyond me.

Ivor

In article <63edg4F2791n3U1@mid.individual.net>,
Ivor Jones <ivor@thisaddressis.invalid> wrote:[color=blue]
>
>
>"R. Mark Clayton" <nospamclayton@btinternet.com> wrote in
>message news:8qSdnbgXqYPCtEzanZ2dneKdnZydnZ2d@bt.com
>
>[snip]
>
>: > It is possible to VOIP over an ISDN connection, but I
>: > never tried it. The quality would probably be similar
>: > to PSTN, but not as good as raw ISDN.
>
>Germany uses VoIP over ISDN, it works fine. Why BT can't/won't do it is
>beyond me.[/color]

Are you sure you don't mean ADSL over ISDN?

Although VoIP is possible with a PPP IP link over bonded ADSL lines,
I can't see why you'd really want to run VoIP over ISDN when it has 2
perfectly good 64Kb channels plus a separate data path for signalling...

Gordon

"Gordon Henderson" <gordon+usenet@drogon.net> wrote in
message news:fqti09$28a4$1@energise.enta.net
: > In article <63edg4F2791n3U1@mid.individual.net>,
: > Ivor Jones <ivor@thisaddressis.invalid> wrote:
: >>
: >>
: >>"R. Mark Clayton" <nospamclayton@btinternet.com> wrote
: >>in
: >>message news:8qSdnbgXqYPCtEzanZ2dneKdnZydnZ2d@bt.com
: >>
: >>[snip]
: >>
: >>: > It is possible to VOIP over an ISDN connection, but
: >>: > I never tried it. The quality would probably be
: >>: > similar to PSTN, but not as good as raw ISDN.
: >>
: >>Germany uses VoIP over ISDN, it works fine. Why BT
: >>can't/won't do it is beyond me.
: >
: > Are you sure you don't mean ADSL over ISDN?

Yes silly me, it was late at night. But if you've got ADSL over ISDN then
VoIP over that still works ;-)

Ivor