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Home > Archive > Voice Over IP in UK > December 2006 > FAQ? Looking to add VOIP to analogue system
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FAQ? Looking to add VOIP to analogue system
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| Clint Sharp 2006-12-14, 7:11 pm |
| Right, be nice to me, I've been thrown in at the deep end with this and
the learning curve for *all* the new skills I need is looking vertical!
Basically, I need a VOIP telephone extension for eight lines to an
existing analogue exchange, there will be a business broadband (800K up)
link between the two sites and the 'lines' do not need externally
accessible numbers (but it might be nice if they could have sequential
non-geographical ones in the future)
I can't seem to find an example of such a setup from a quick google,
probably because I don't know the terminology used to describe it. If
you can point me in the right direction or at least to a FAQ/tutorial on
VOIP it would help.
Thanks.
--
Clint Sharp
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| Clint Sharp used his keyboard to write :
> Right, be nice to me, I've been thrown in at the deep end with this and the
> learning curve for *all* the new skills I need is looking vertical!
> Basically, I need a VOIP telephone extension for eight lines to an existing
> analogue exchange, there will be a business broadband (800K up) link between
> the two sites and the 'lines' do not need externally accessible numbers (but
> it might be nice if they could have sequential non-geographical ones in the
> future)
>
> I can't seem to find an example of such a setup from a quick google,
> probably because I don't know the terminology used to describe it. If you can
> point me in the right direction or at least to a FAQ/tutorial on VOIP it
> would help.
>
Are the eight lines, together with the analogue exchange, in one
location and the required voip phone in another?
Below are some good reference guides, if I understood you correctly.
<http://www.provu.co.uk/pdf/sipura/ ...1001
.pdf>
<http://www.provu.co.uk/pdf/sipura/s..._2x_spa3000.pdf>
<http://www.provu.co.uk/pdf/sipura/ ...2000
.pdf>
<http://www.provu.co.uk/support.html>
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| Clint Sharp wrote:
> In message <mn.74ef7d6cd9a29ae3.48968@blueyonder.invalid>, Jono
> <nothanks@blueyonder.invalid> writes
> Yes, that pretty much sums it up except that it's VOIP phones plural.
> Looking to link them to the existing office and PBX
>
You don't say what PBX you have in your current office but if it is an
ordinary analogue one (i.e. not some proprietary digital thing) then you
can use the Linksys/Sipura adaptors. You need a free analogue extension
port for each "remote" telephone on the system, just like you would if
you were connecting them locally. You connect a Linksys SPA-3102 to
each port which is also connected to the Internet. Then at the remote
location you have more Linksys adaptors (PAP2Ts would probably be the
cheapest solution, you could plug two independent phones into each one)
with the analogue telephones connected to them. Following the
configuration in my PDFs above means that any number dialled on the
telephones is sent over the Internet, to the SPA-3102s and into the PBX.
The trick to getting it right usually lies in configuring the 3102 to
interoperate with your PBX system. In particular, line voltages and
disconnect handling are areas people struggle. You need to know the
exact specification of your PBX, the SPA-3102 can be setup to work with
pretty much anything but you need to know what you're aiming for. Just
assuming the specs of the analogue ports are the same as a BT wall
socket has caused many people many sleepless nights. 
cheers,
Paul.
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| Clint Sharp 2006-12-16, 1:11 pm |
| In message <45828c88$0$761$5a6aecb4@news.aaisp.net.uk>, Paul
<nomailforme@polog40.org.uk> writes
>The trick to getting it right usually lies in configuring the 3102 to
>interoperate with your PBX system. In particular, line voltages and
>disconnect handling are areas people struggle. You need to know the
>exact specification of your PBX, the SPA-3102 can be setup to work with
>pretty much anything but you need to know what you're aiming for. Just
>assuming the specs of the analogue ports are the same as a BT wall
>socket has caused many people many sleepless nights.
>
>cheers,
>Paul.
Thanks to all who replied, I've got some reading to do but at least i
now know where to start. This VOIP stuff is really interesting, how
similar is it to the 21cn stuff BT is rolling out, I.E. is BT using the
same protocols etc. just on a huge scale?
--
Clint Sharp
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| Clint Sharp wrote:
> In message <mn.74ef7d6cd9a29ae3.48968@blueyonder.invalid>, Jono
> <nothanks@blueyonder.invalid> writes
>
>
> Yes, that pretty much sums it up except that it's VOIP phones plural.
> Looking to link them to the existing office and PBX
>
>
With multiple lines, you'd be better looking at a multi-port
gateway. These typically come with 4, 8 or 16 ports and
there are versions for the PBX extension (FXO) and (if using
analogue phones) the terminals (FXS).
Note that users might not be able to transfer calls (except,
maybe, to other gateway terminals) or access other PBX features.
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| Clint Sharp wrote:
> I can't seem to find an example of such a setup from a quick google,
> probably because I don't know the terminology used to describe it. If
> you can point me in the right direction or at least to a FAQ/tutorial on
> VOIP it would help.
>
The terminology you need to know is longline extension.
Tim
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| Clint Sharp wrote:
> Thanks to all who replied, I've got some reading to do but at least i
> now know where to start. This VOIP stuff is really interesting, how
> similar is it to the 21cn stuff BT is rolling out, I.E. is BT using the
> same protocols etc. just on a huge scale?
In theory yes.
In practice, who knows.
Tim
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| hairydog@despammed.com 2006-12-20, 7:11 am |
| On Sat, 16 Dec 2006 12:29:22 +0000, Clint Sharp
<clint@clintsmc.demon.co.uk> wrote:
>how
>similar is it to the 21cn stuff BT is rolling out, I.E. is BT using the
>same protocols etc. just on a huge scale?
Think so. My guess is that they'll use cisco kit and/or protocols. But
BT seem to have the ability to snatch defeat from the jaws of victory,
so no doubt there will be a snag.
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| hairydog@despammed.com wrote:
> On Sat, 16 Dec 2006 12:29:22 +0000, Clint Sharp
> <clint@clintsmc.demon.co.uk> wrote:
>
>
> Think so. My guess is that they'll use cisco kit and/or protocols. But
> BT seem to have the ability to snatch defeat from the jaws of victory,
> so no doubt there will be a snag.
They are supposed to be using SIP:
http://www.btplc.com/21CN/Thetechno...ies/SIP/SIP.htm
cheers,
Paul.
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| ale.cx 2006-12-20, 1:11 pm |
| Paul wrote:
> They are supposed to be using SIP:
>
> http://www.btplc.com/21CN/Thetechno...ies/SIP/SIP.htm
Is this going to be visible from a user's perspective? IE will I be
able to use a SIP client instead of an ordinary analogue phone to
make/receive calls on my "BT" number?
alexd
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| Clint Sharp 2006-12-20, 7:11 pm |
| In message <cb5io21b8bb0dte2mc9flcsqki9b68aas1@4ax.com>,
hairydog@despammed.com writes
>On Sat, 16 Dec 2006 12:29:22 +0000, Clint Sharp
><clint@clintsmc.demon.co.uk> wrote:
>
>
>Think so. My guess is that they'll use cisco kit and/or protocols. But
>BT seem to have the ability to snatch defeat from the jaws of victory,
>so no doubt there will be a snag.
Not sure who they're using but it sank Marconi as they were bidding to
supply it a few years ago and lost, just can't remember who to at the
moment.
--
Clint Sharp
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