asterisk users - Sep 2006 - Any suggestions about VoIP provider?

Hi,

I have a client operating a call center in Jordan, he
has a new 5 years 
project to make and receive VoIP calls to/from the US.
The project requires a T1 US termination (24 lines)
with at least 99.9% 
uptime and perfect voice  quality and multiple area
codes.
Can anyone suggest a VoIP provider in the United
States (preferably out of 
experience) who can provide the above termination
needs?
Quality and uptime is the prime factor in the decision
and not price.

You can email me off list if you want,

Thank you and best regards,

Antoine Megalla
SAND (S.A.E) 



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