VOIP via ADSL

[Paul Warner]

Hi Guys.

The company that I work for wants to do a proof of concept VOIP via
ADSL. Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

At work we have a Nokia M21122 and at home I have a DSE 1149
router. Both I suspect don't support this too well.

I have done testing before and got the phone off our PBX system to
come up but no speech when called .

We asked our parent in Oz and they say that they have one site doing
this over there using a VPN over ADSL set up .

I suspect that our ADSL routers here at work and at home may not support VPN???

If we buy a couple of routers that do can any one suggest an item
and an approximate price.
If we get the routers do we have to get our ISPs (Xtra work and
Orcon home) to setup and VPN tunnelling system for us??

Thanx in advance.


Paul Warner

***@bigfoot.com

DVD spelt backwards is DVD

[Juha Saarinen]

Post by Paul Warner
Hi Guys.
The company that I work for wants to do a proof of concept VOIP via
ADSL. Yeah I know ADSL in NZ is not the best for VOIP but it can be done.
At work we have a Nokia M21122 and at home I have a DSE 1149 router.
Both I suspect don't support this too well.
I have done testing before and got the phone off our PBX system to come
up but no speech when called .
We asked our parent in Oz and they say that they have one site doing
this over there using a VPN over ADSL set up .
I suspect that our ADSL routers here at work and at home may not support VPN???
If we buy a couple of routers that do can any one suggest an item and
an approximate price.
If we get the routers do we have to get our ISPs (Xtra work and Orcon
home) to setup and VPN tunnelling system for us??
Thanx in advance.

It does work - I've used e.g. Callplus' iTalk service quite succesfully
over Xtra DSL - but the 128k upstream can limit quality unless you use a
low bitrate CODEC. This of course will limit voice quality as well.

The 64kbit/s G.711 CODEC which provides PSTN quality sound consumes
around 80kbit/s, leaving you with very little room on the upstream pipe
so some form of QoS traffic management will be necessary.

As for the routers, it depends on the requirements of your VoIP devices
as to which ones are suitable and how they should be configured. NAT can
make things difficult, for instance, but the newer devices can make
their way through that.

[Greg Brackley]

The company that I work for wants to do a proof of concept VOIP via ADSL.
Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

I've had a bit of a play with Asterisk and VoIP. It's clearly an early
adopters market. With the limited upstream bitrates, VoIP seems to be
possible.

I've used the non-bitstream access DSL (2meg/192k), and not Xtra as an ISP.

My first attempts were ok, but the voice quality broke up reasonably often.
Once I implemented LLQ (low latency queuing) and LFI (link fragmentation and
interleaving), these problems appear to have gone away. I can
simultaneously have downloads running and the voice quality remains good. I
use Cisco 827/837 routers to terminate the DSL circuit. I imagine these same
techniques could be used by gamers so that there games don't lag when other
members of the household/flat start surfing.

I haven't run VoIP over a VPN, but I would imagine you would still need to
employ QOS.

I have used austech partnerships (ATP) for local access in Australia for a
while (http://www.austechpartnerships.com/atp/). At AU$10 a month, you get a
phone number (I have one in Sydney), and calls to Australian capital cities
are about AU12c flat rate per call.

I have also started using iTalk for a phone line in Auckland
(http://www.italk.co.nz). I have family in Auckland, and it means I can call
them (or they can call me) any time of the day or night as a 'free' local
call. At $10 a month for a phone line in Auckland it looks cheap compared to
other offerings. Plus you get caller id, voice mail, and other services
thrown in. I notice that like the ATP service, the iTalk service supports
multiple concurrent calls.

Greg :-)

[Richard Naylor]

Post by Greg Brackley

The company that I work for wants to do a proof of concept VOIP via ADSL.
Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

I've had a bit of a play with Asterisk and VoIP. It's clearly an early
adopters market. With the limited upstream bitrates, VoIP seems to be
possible.

It works fine.

We started with VoIP in 99 buying from Selsius, the company Cisco bought.
Our early "Csico" phones had the Selsius badge on them. They worked fine.
We did investigate offering a VoIP service but walked away from it due to
the actions of the Commerce Commission and "the Deed".

We now use CallPlus Comverge.

However, I used to run a Cisco 8274V at home when the kids lived at home.
It was set up on the Cisco Call Manager at th eoffice and gave us 4 lines +
fax at home. It worked fine - other than the effect best described as
"early days of DSL with Telecom". We have full rate DSL 3meg down 700k up.

Based on our experience we set up an interoffice toll by pass for a Hutt
company. They have 3 827s as tie trunks on their PABX and call between WN,
AKL, CHC and now Brisbane, for around 1 cent a minute. Payback was 3 months.

I now use the Slingshot phones at home and in my van and they go fine. They
even work over my IPStar sat connex. The latency is a challenge but the
quality is great. Over DSL latency isn't an issue. If your pings are below
200ms you'll never know its voip. We learned that back in 1998 in tests
between US and NZ.

Rich

[Matt Riddell]

Last month I made 200,000 minutes of free inter-asterisk calls using the
Asterisk open source PABX.

We have installations ranging from 5 users to 400,000.

The only problem is that when the net goes down you have to failover to
PSTN. Also, the more VoIP takes off, the more I would expect telecom to
push for the 2000ms latency their docs specify.
--
Cheers,

Matt Riddell
_______________________________________________

http://www.sineapps.com/news.php (Daily Asterisk News - html)
http://www.sineapps.com/rssfeed.php (Daily Asterisk News - rss)

[Greg Brackley]

The company that I work for wants to do a proof of concept VOIP via ADSL.
Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

I've had a bit of a play with Asterisk and VoIP. It's clearly an early
adopters market. With the limited upstream bitrates, VoIP seems to be
possible.

I've used the non-bitstream access DSL (2meg/192k), and not Xtra as an ISP.

My first attempts were ok, but the voice quality broke up reasonably often.
Once I implemented LLQ (low latency queuing) and LFI (link fragmentation and
interleaving), these problems appear to have gone away. I can
simultaneously have downloads running and the voice quality remains good. I
use Cisco 827/837 routers to terminate the DSL circuit. I imagine these same
techniques could be used by gamers so that there games don't lag when other
members of the household/flat start surfing.

I haven't run VoIP over a VPN, but I would imagine you would still need to
employ QOS.

I have used austech partnerships (ATP) for local access in Australia for a
while (http://www.austechpartnerships.com/atp/). At AU$10 a month, you get a
phone number (I have one in Sydney), and calls to Australian capital cities
are about AU12c flat rate per call.

I have also started using iTalk for a phone line in Auckland
(http://www.italk.co.nz). I have family in Auckland, and it means I can call
them (or they can call me) any time of the day or night as a 'free' local
call. At $10 a month for a phone line in Auckland it looks cheap compared to
other offerings. Plus you get caller id, voice mail, and other services
thrown in. I notice that like the ATP service, the iTalk service supports
multiple concurrent calls.

Greg :-)

[Mark Cranness]

----- Original Message -----

Post by Paul Warner
The company that I work for wants to do a proof of concept VOIP via
ADSL. Yeah I know ADSL in NZ is not the best for VOIP but it can be done.
(snip)
We asked our parent in Oz and they say that they have one site doing
this over there using a VPN over ADSL set up .

I suspect the VPN is a red herring, at least for a proof of concept.
The VPN will allow data through the firewall/router, but if you don't have a
VPN already, you would have to modify the routers/firewalls to allow VPN
through, so why not modify them to allow VOIP through?

I tried sipserve.co.nz (currently free for PC to PC calls, costs per minute
for PC to real phone numbers), and it worked OK.
I had to pinhole some ports in my router.
(You'll have to google to find out how to pinhole/forward ports for your
routers/firewalls.)

The PC based iPhone that sipserve suggest (XTen X-Lite), didn't work without
some ports pinholed/forwarded, and it was difficult to find out which ports
to forward.
(XTen try and use STUN and xTunnel and other mumbo jumbo in an attempt to
avoid having to pinhole ports, but it didn't work.)

Pinhole port 5060, protocol UDP and ports 8000 thru 800x protocol UDP
through to the test PCs.
(These ports listed in the X-Lite setup menu under System
Settings>Network>Listen SIP and Listen RTP ports.)

You only *need* one 800x port, but more would allow conferencing and such...

Mark

[Bruce Barton]

I have been using VOIP on ADSL for about 3 years using an Intertex IX66 and
IX66+. It has a built in SIP server with a 5 user licence, statefull
inspection firewall, VPN and a SIP proxy. I have use it with
www.gossiptel.co.uk for a UK telephone number, Freeworld Dialup, etc. The
SIP switch add on makes it a SIP PBX. It requires no pinholing for SIP
VOIP.

Unfortunately they are not sold in NZ although I believe there is an outlet
in Australia. See www.intertex.se for the IX66+ and the IX67 for cable.
The IX68 is due out later in the year (ADSL and ADSL 2).

Email me if you would like more information

Bruce Barton



-----Original Message-----
From: owner-***@unixathome.org [mailto:owner-***@unixathome.org] On Behalf
Of Paul Warner
Sent: 30 June 2005 9:42 a.m.
To: ***@lists.unixathome.org
Subject: VOIP via ADSL

Hi Guys.

The company that I work for wants to do a proof of concept VOIP via ADSL.
Yeah I know ADSL in NZ is not the best for VOIP but it can be done.

At work we have a Nokia M21122 and at home I have a DSE 1149 router. Both I
suspect don't support this too well.

I have done testing before and got the phone off our PBX system to come up
but no speech when called .

We asked our parent in Oz and they say that they have one site doing this
over there using a VPN over ADSL set up .

I suspect that our ADSL routers here at work and at home may not support
VPN???

If we buy a couple of routers that do can any one suggest an item and an
approximate price.
If we get the routers do we have to get our ISPs (Xtra work and Orcon home)
to setup and VPN tunnelling system for us??

Thanx in advance.


Paul Warner

***@bigfoot.com

DVD spelt backwards is DVD

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