Linking into the exchange

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coloured

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#15408 21-Aug-2007 15:52

Hi Guys, I am looking for some more information so that I can get my head around the whole voip concept, namely infrastructure from the voip handset to the person on the pstn line at the other end.

the main part that I am having trouble with is; taking the digital internet traffic and passing it into the telecom pstn network.
At the moment - I am looking to move to voip in Whangarei, currently the only DID's that can be provided to me are from Auckland, which would mean people trying to call me would have to call an auckland number... to get me in whangarei and then pay telecoms charge for that.
What infrastructure is needed in the exchange here in Whangarei to enable me to get a local DID? Someone said something about an ISDN router.

If someone could point me in the direction of some useful docmentation regarding how it all fits together that would be very helpful. I am a network administrator so I have some understanding of how it might fit together but am lost as far as what gear is required to connect to the digital internet traffic to the exchange etc.

cheers
Jurgen

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inquisitor

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#83224 21-Aug-2007 20:47

Generally there's no need for a VoIP Gateway in every local exchange in order to get local DID numbers. In PSTN networks there are routing tables, that assign every phone number to a certain Telco. According to this table Telcos will forward phone calls either into their own network or to another operator. Therefore operators need to set up peering points for so-called "interconnection" of their networks. Normally there are few peering points in PSTN networks and I guess in a country like NZ there could be only one in the whole country.
So in order to offer local DID numbers a provider would only need some entries in the routing table, that would make calls to certain numbers being forwarded to some peering point and so to their network.
That could mean, that a local phone call from someone in Christchurch, who's with Telecom NZ, to his neighbour, who is a VoIP customer, could be forwarded to Auckland, because there's the nearest and only interconnection between networks and the VoIP provider would transfer the call back to you, but now through IP.

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coloured

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#83271 22-Aug-2007 08:13

thanks inquisitor, so I guess what I need to know is who or how do I get a voip gateway put into an exchange in my local area?
Am I right in thinking this is what needs to happen?

I have spoken to some people who offer voip services and they have told me that currently they can only provide the service for ppl in auckland (closest to me). They said I would need to find approximately 100 customer lines for it to be worthwhile them putting in this piece of hardware (they said it was some sort of isdn device) into the exchange.
What is this piece of hardware?

sorry if I have repeated myself within this post - if anything hopefully it will show that I havent quite got a grip on it all yet.

Jurgen

inquisitor

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#83284 22-Aug-2007 09:15

What I wanted to say is, that you don't need hardware in every local exchange, but a central peering point with Telecom New Zealand and all the rest is done by routing (software).

Apparently NZ market regulation isn't very far advanced and so smaller providers can't get local DID numbers in that way. Here in Germany providers can get DID numbers in blocks of 100 pieces each and they don't need POPs (points-of-presence) for interconnection in every local exchange but only some regional ones.

Alternatively providers could get ISDN-based DDI lines and assign extension numbers to their VoIP customers. But that's a botchy solution. Anyway for this method you would need an asterisk server with ISDN and internet connection, which is located somewhere in your local network. The costs would be at least $2000 for hardware + the monthly costs for ISDN and IP connection.

nate

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#83287 22-Aug-2007 09:36

Hi Jurgen

From my understanding of your post, you're looking at moving your business over to Voice-over-IP and the problem you're having is no local DIDs in your calling area of Whangarei?

If this is correct, our VoIP provider (also known as a ITSP) has DIDs in your area, and we can help you with a new "pure" VoIP system or integrating one of our ISDN VoIP gateways into your existing PBX. More info is available here and you can contact me here.

Regards
Nathan

willnz

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#83322 22-Aug-2007 13:14

Public self promoting isn't generally tolerated here Nathan - suggest you PM Jurgen before your post is removed by one of the mods

freitasm

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#83329 22-Aug-2007 13:52

Thanks for bringing this up. The way I see it Nathan is not going out of FUG because it's in context. It's not like those spam messages we see around and clean up very quickly. . .

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willnz

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#83330 22-Aug-2007 13:55

freitasm: Thanks for bringing this up. The way 1 see it Nathan is not going out of FUG because it's in context. It's not like those span messages we see around and clean up very quickly. . .

I did think about that, and thought it might've been a reasonable post, but thought I'd mention it all the same just in case :)

exportgoldman

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#83354 22-Aug-2007 16:06

freitasm: Thanks for bringing this up. The way 1 see it Nathan is not going out of FUG because it's in context. It's not like those span messages we see around and clean up very quickly. . .

Call me blonde, but I have no idea in the world after reading this three times what you mean. Who's been smoking too much, me or you?

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#83355 22-Aug-2007 16:08

FUG = Forum Usage Guidelines, another TLA (Three Letter Acronym). It means he's not posting off topic, and is not spamming the forum.

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