[Asterisk-Users] How to compare VOIP providers

[PROTANUSA at aol.com]

When evaluating inbound VOIP call service providers, what's the "industry  
standard" or criteria that we would ask for from each provider in order to  
evaluate a specific provider's:
    *   quality of inbound service as it relates to overall call quality  
(from a user experience perspective) 
    *   call completion success rate as a % of all calls initiated
.....so that we can compare one provider's service objectively to another  
providers service? 
 
Would the same industry standard/criteria be used to compare outbound call  
providers? 
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