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I am student in Telecommunication and I need information on how to use
VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
via the internet. Is it possibe to configure the system to be used
just over the Local Area Network whereby calls from on side of the
network are routed over the data network (not the internet) to another
side of it.
In such a system would you need a gateway or a gatekeeper since the
packets remain in just the LAN? What actually do you need for such a
sytem? I would be pleased if someone could explain or give me a URL
with this information.

Thanks.

(reneluve) wrote:

>I am student in Telecommunication and I need information on how to use
>VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
>via the internet. Is it possibe to configure the system to be used
>just over the Local Area Network whereby calls from on side of the
>network are routed over the data network (not the internet) to another
>side of it.
>In such a system would you need a gateway or a gatekeeper since the
>packets remain in just the LAN? What actually do you need for such a
>sytem? I would be pleased if someone could explain or give me a URL
>with this information.
>
>Thanks.


I'd like to know that too. If you get info post it here also.

"reneluve" <> wrote in message
news: om...
> I am student in Telecommunication and I need information on how to use
> VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
> via the internet. Is it possibe to configure the system to be used
> just over the Local Area Network whereby calls from on side of the
> network are routed over the data network (not the internet) to another
> side of it.
> In such a system would you need a gateway or a gatekeeper since the
> packets remain in just the LAN? What actually do you need for such a
> sytem? I would be pleased if someone could explain or give me a URL
> with this information.
>
> Thanks.

Hi

have a look at Cisco and Mitels websites to start.

But as to gateways etc it depends on if you want to cal outside the LAN,
Odds on you do so you will need a gateway and a call manager for call
control etc.
But dont get to bogged down Voip is only another way of moving encoded voice
data between end points.

Ian

hi
> In such a system would you need a gateway or a gatekeeper since the
> packets remain in just the LAN? What actually do you need for such a
> sytem? I would be pleased if someone could explain or give me a URL
> with this information.
gatekeeper maps numbers,aliases or similar to ip-addresses and ports
(or well-known ports), so if You have a static address name space in a
LAN, one can make calls with an IP address, if Your phone supports this.
You dont need a gateway, becuase the calls do not leave the IP network
way of pots or isdn.
w.

"reneluve" <> wrote in message
news: om...
> I am student in Telecommunication and I need information on how to use
> VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
> via the internet. Is it possibe to configure the system to be used
> just over the Local Area Network whereby calls from on side of the
> network are routed over the data network (not the internet) to another
> side of it.
> In such a system would you need a gateway or a gatekeeper since the
> packets remain in just the LAN? What actually do you need for such a
> sytem? I would be pleased if someone could explain or give me a URL
> with this information.

SIP phones will generally work fine over a LAN (no gateway) provided there
are no firewalls in the way.

H.323 VoIP terminals generally won't work without a gateway.

Older VoIP applications using proprietary protocols (instant messaging
programs etc) generally won't work without a gateway. I'm not sure about
more recent ones.

Any computer that's behind a firewall or NAT router generally needs some
sort of gateway, because it's invisible to the outside world and therefore
can't receive incoming calls unless it has initiated a connection to an
intermediary.

--
Phil McKerracher
www.mckerracher.org

"Phil McKerracher" <> wrote in
news:LpdPb.4868$:

> SIP phones will generally work fine over a LAN (no gateway) provided
> there are no firewalls in the way.
>
> H.323 VoIP terminals generally won't work without a gateway.

Don't you mean gatekeeper in the last sentence? Anyway, neither is true.
Most phones have the ability to also "dial" IP addresses

--
Andreas

"reneluve" <> wrote in message
news: om...
> I am student in Telecommunication and I need information on how to use
> VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
> via the internet. Is it possibe to configure the system to be used
> just over the Local Area Network whereby calls from on side of the
> network are routed over the data network (not the internet) to another
> side of it.

Voip works over IP - doesnt matter whether it is a LAN or a WAN or something
more complex.

The protocols dont care that the transport is high speed, low loss and low
latency, but it does simplify things for a designer since delays are lower,
and QoS and call admission less of an issue with the much higher capacity of
the LAN compared to the requirements of each call.

In practice a lot of LAN based VoIP systems are pretending to be a PBX -
normally this is called IP telephony, IP PBX or something similar.

LAN IP telephony tends to use a higher bandwidth CODEC such as G.711 - not
much point tryinh to compress down to 8k when bandwidth is not a limited
resource.

> In such a system would you need a gateway or a gatekeeper since the
> packets remain in just the LAN? What actually do you need for such a
> sytem? I would be pleased if someone could explain or give me a URL
> with this information.

Depends - gatekeepers are there for several reasons, some to do with call
admission and bandwidth control which may not matter as much on a LAN, and
others such as IP address mapping which are still useful.
>
> Thanks.
--
Regards

Stephen Hope - remove xx from email to reply

thank you all for your advice,
now what if I want to build the system myself just with traditional
telephones each connected to a computer on the LAN. What could I use
to create the interface (not a hardware) someone told me I could use
TAPI 3.0 and configure it , I don't know much about that.

regards.
rene

"reneluve" <> wrote in message
news: m...
> thank you all for your advice,
> now what if I want to build the system myself just with traditional
> telephones each connected to a computer on the LAN. What could I use
> to create the interface (not a hardware) someone told me I could use
> TAPI 3.0 and configure it , I don't know much about that.
>
> regards.
> rene

Not sure you could. You would need something to provide voltage and tone for
the phone, effectively recreating the wheel here. Just use a softphone, or
an actual IP phone (by the way most IP phones have a built in mini-switch so
you only need one Ethernet port). An ATA would allow you to run a Telco
conversation across a LAN, but why would you want to when you could just use
a freeware softphone at each PC.

Hi,
have you founded something to this topic? I´m a student in
telecommunications too. i have the same problem.
Are something in German?
Perhaps you can write me on
Ok? Thanks

"reneluve" <> schrieb im Newsbeitrag
news: om...
> I am student in Telecommunication and I need information on how to use
> VoIP in a LAN setting. So far all I'm getting is using VoIP over a WAN
> via the internet. Is it possibe to configure the system to be used
> just over the Local Area Network whereby calls from on side of the
> network are routed over the data network (not the internet) to another
> side of it.
> In such a system would you need a gateway or a gatekeeper since the
> packets remain in just the LAN? What actually do you need for such a
> sytem? I would be pleased if someone could explain or give me a URL
> with this information.
>
> Thanks.