Latency - VOIP Concerns

So I'm looking at a couple of different VOIP providers - SIP connections back to my SIP phones.

How much of a issue is latency with VOIP ? I know lower the better...
Are there any tools to measure jitter between Point A-Point B

The one carrier I like due to features, confidence in the provider itself, customer service, etc. I'm out in NYC and their VOIP gateway is out in Fremont - XO datacenter. I'm getting 95ms reads


Option 2 is a different provider. Closer to me down in Dallas. Nice traces averaging 55ms - looks like they're using internap. Similar amount of hops to get to both gateways.

 

 

 

 

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