asterisk users - Mar 2006 - simple question on asterisk

Hi,
I am planning to deploy an asterisk installation but I need to convince 
a few managers that its a good idea.
Theres something I don't quite understand though,
I plan deploy a box on the end of 4 channel BRI ISDN and provide it an 
ADSL internet connection.
Should a phone behind the asterisk PBX wish to call a VOIP phone number 
number, say an 0844 one from www.voip-user.org, would it send this 
automatically over the PSTN ISDN network or would it know to send the 
call over the internet.
Would I need a SIP provider on the internet to forward the calls? I 
assume I would need some sort of directory service to know where to 
route the call.
Thanks in advance,
Mark

Its all about how you configure your dialplan. Asterisk doesn't know what a
PSTN or VOIP phone number is. If you want all 08444 numbers to go through a
certain trunk, then you set your dialplan up accordingly.
-Kerry
 
> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com 
> [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of 
> Mark Hayward
> Sent: Monday, March 20, 2006 8:21 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [Asterisk-Users] simple question on asterisk
> 
> Hi,
> I am planning to deploy an asterisk installation but I need 
> to convince a few managers that its a good idea.
> Theres something I don't quite understand though, I plan 
> deploy a box on the end of 4 channel BRI ISDN and provide it 
> an ADSL internet connection.
> Should a phone behind the asterisk PBX wish to call a VOIP 
> phone number number, say an 0844 one from www.voip-user.org, 
> would it send this automatically over the PSTN ISDN network 
> or would it know to send the call over the internet.
> Would I need a SIP provider on the internet to forward the 
> calls? I assume I would need some sort of directory service 
> to know where to route the call.
> Thanks in advance,
> Mark
> 
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