ITSP that works well with Asterisk

[Henry [VoIP-PBX.ca]]

Hi all, my client needs a toll free number (8xx) and good coverage 
within Canada and the US  for outgoing calls to the PSTN.
The cost per is not as important as the quality and  it must work well 
with Asterisk systems .
Thanks for any help you can give.

Henry 
      


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