You need to carefully consider outside VoIP providers IMHO.  I would look for providers who are very upfront about their network architecture and how they connect to the PSTN (the public telephone network).  As a minimum, I would ask for IP addresses to some of their SIP servers and check ping times.  I would look for consistent ping times at different times of the day with round trips below 50ms ideally but definitely no more than 100ms.  A lot of this depends on geography.  It is also important to know how they connect to the public phone network IMHO.   Ideally, they have direct "TDM" connections (digital telephone connections) as opposed to IP connections to who knows where. 
 
There are other considerations as well but I think that is a good start IMHO.


From: Bruce Reeves [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 02, 2006 4:58 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Asterisk with VoIP phone

Yes this is possible, you just setup the softphones and maybe the provider in sip.conf and write your dialplan :)

On 8/1/06, J Rangi < [EMAIL PROTECTED]> wrote:
Hello,

Is is possible to setup an asterisk server with out buying Digium card.
I mean can we do this type of setup.
We all know that X-Lite can be used as a soft phone to have an IP
extension.
Is it possible to take a service from another VoIP service provider, and
get the IP phone number. Make that phone numbe gateway to outside world.
Now all the internal extensions use that phone to receive and make calls
to out side world.
Has any one done this kind of setup or know anything about this.

Thank you,
-Jai
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Bruce
Nortex Networks
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