[Asterisk-Users] asterisk and pstn

Thu Nov 25 10:08:01 MST 2004

Again, thanks for the pointers.

Much appreciated,
Aisling.

---- Original Message ----
From: kevin.brennan at redsquared.com
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] asterisk and pstn
Date: Thu, 25 Nov 2004 15:10:43 -0000

>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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>
>
>
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