[Asterisk-Users] asterisk and pstn

[Kevin Brennan]

If this is to gain knowledge a good source of background information is the
IP telephony cookbook http://www.informatik.uni-bremen.de/~prelle/terena/,
you should find some answers there.

One solution you did not mention is the use of a 3rd party VOIP-PSTN/PLMN
gateway - ie. you connect using H.323/SIP/IAX/whatever and they have the
PSTN/PLMN interface hardware.

Br /Kev/

----- Original Message -----
From: "Ashling O'Driscoll" <ashling.odriscoll at cit.ie>
To: <asterisk-users at lists.digium.com>
Sent: Thursday, November 25, 2004 11:13 AM
Subject: Re: [Asterisk-Users] asterisk and pstn


Thank you very much for the reply. That has made things a good bit
clearer. Am I correct in my current understanding:

So basically if I want to support approx 100 calls, I would have to
purchase a digium PRI card and then pay eircom (or whoever my service
provider is) approx 3000 a year for the PRI ISDN connection??

My other option is to have a BRI connection which could support
approx 8 calls ("calls perline, 4 line card) and pay my service
provider alot less for a bri connection.

I could also use an fxo card in * connected to my hpine line but that
would only support one call at a time.

Are these the only main implementation options? Has anyone come
across the Skype Voip gateway (VTA1000) or where does that fit in the
scheme of things?.....are there new options emerging??

Sorry if these questions seem a bit dense but I am doing this as part
of a research project and since I am a student who has has no
experience working in industry I am clueless when it comes to how
such a service would be implemented in practice and the cost of it. I
am appreciative of any knowledge passed on from others who have
practical know how.

Thanks again,
Aisling.


---- Original Message ----
From: kevin.brennan at redsquared.com
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] asterisk and pstn
Date: Wed, 24 Nov 2004 21:11:02 -0000

>
>
>> In simple terms ISDN is a digital interface to the PSTN as opposed
>to the
>> analogue RJ11 phone connectors your used to at home (POTS - Plain
>Old
>> Telephony System).  ISDN lines (Integrated Services Digital
>Network)
>> typically comes in two configurations BRI (Basic Rate has 2B+D
>channels
>ie.
>> 2 speech 1 data ) and PRI (Primary Rate , (Europe)30B+D - 30 speech
>+ 1
>> data). Because ISDN is digital the interface it's more advanced and
>supports
>> a much wider set of functions and services than POTS. In Ireland
>Eircom
>> market ISDN as 'hi-speed', you may be familiar with this (this is
>not
>ADSL,
>> your not always online). The main suppliers of this type of service
>would
>be
>> Eircom, Esat and COLT. Line rental for PRI will be in the order of
>?3K/month
>
>Sorry that should read ?3K/annum
>
>> plus a setup fee (yes - that puts the cost of the card in
>perspective).
>>
>> To conect your * box to PSTN with BRI/PRI interface you'll need one
>of
>> digium's cards or an equivalent CAPI card.
>> Br /Kev/
>>
>> ----- Original Message -----
>> From: "Ashling O'Driscoll" <ashling.odriscoll at cit.ie>
>> To: <asterisk-users at lists.digium.com>
>> Sent: Wednesday, November 24, 2004 4:17 PM
>> Subject: [Asterisk-Users] asterisk and pstn
>>
>>
>> Hi,
>>
>> First of all apologies because this isn't strictly a purely
>asterisk
>> question.
>>
>> I am quite new to asterisk and actually to voip/telephony as a
>whole.
>> I currently have sip calls working through asterisk. The asterisk
>> server is behind a linksys router. I would now like to connect
>calls
>> to the pstn. I have researched into several ways to do this but
>> because I am not very knowledgeable about telephony I am now quite
>> confused. This is what i understand so far. If this is incorrect or
>> if anybody has any ideas as to I could implememnt this in a
>> better/more scalable fashion, I would really appreciate it.
>>
>> I could put a fxo card in my asterisk server and connect this to a
>> telephone line. This would enable sip to pstn calls but only one
>call
>> at a time. To connect analog phones from the inside network(i.e.
>the
>> asterisk network) going out I would need an fxs card.
>>
>> Now the problem with the above scenario is that only one call would
>> be allowed at a time. I know I could get an fxo card with a few
>ports
>> but that would still only allow a few calls. To implement a network
>> where several calls are possible then do I need a pbx with a PRI
>> interface?? Also where does all the digium cards come in all
>> this??Where do they fit in??
>>
>> I would be extremely grateful if somebody could shed some light on
>my
>> currently very hazy understanding of voip telephony with asterisk
>>
>> Thanks again,
>> Aisling.
>>
>>
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>received by you in error please contact the sender at the above
>quoted email address. Any unauthorised form of reproduction of this
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-------------------Legal  Disclaimer---------------------------------------

The above electronic mail transmission is confidential and intended only for
the person to whom it is addressed. Its contents may be protected by legal
and/or professional privilege. Should it be received by you in error please
contact the sender at the above quoted email address. Any unauthorised form
of reproduction of this message is strictly prohibited. The Institute does
not guarantee the security of any information electronically transmitted and
is not liable if the information contained in this communication is not a
proper and complete record of the message as transmitted by the sender nor
for any delay in its receipt.

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