[Asterisk-Users] asterisk and pstn

Derek Conniffe derek at rivertower.ie
Thu Nov 25 04:38:07 MST 2004 

Hi Ashling - my Eircom "account manager" rang me last Friday and told me 
that they've dropped the installation fee for an E1 PRI from the c 3K to 
zero - nothing. The BRIs are still expensive rental enough - 30.99 / mth 
/ BRI. So 4 BRIs would be 123.96/mth for 8 channels. The PRI with 30 
channels would be 264.11 / month. There is also a "fractional" rate 
connection which is a PRI with only half the channels available - maybe 
that offeres better value-for-month over the 4 BRIs but I'm not sure off 
the top of my head of the pricing for that. (those prices are ex VAT).

You would have another option if you have fibre from one of the other 
carriers (Esat, NTL, etc) - you are in a college so you might have? - 
they can give you E1 lines over their equipment rather than copper 
coming from the outside.

Derek

Ashling O'Driscoll wrote:

>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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-- 


Derek Conniffe
Rivertower Ltd
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