You should qualify your request with your location. Even though IP calls from one US coast to another only have 90ms latency, you are exposed to more possible points of congestion with each additional router your packets go through. A good general rule is to look for a provider within 1000 miles of your location, approx 10 hops, and 50ms.

Check your route to a provider's servers with ping, traceroute and mtr, sometimes a short geographical distance is a long distance on the network and vise-versa.

And now to keep this on topic, I have used Voxee (located in NY) and Teliax (in CO) so far and have had better voice quality with Voxee than with Teliax even though Voxee is closer to be in California. Voxee according to the wiki has a POP on the west coast, but it has not been working over the last month that I've tried. For my uses they are a good backup provider when closer termination providers are not available.

Mike

Mr. Jones wrote:
We are just starting to rollout VOIP in our office, and then to our
broadband customers.

We want to find a termination provider who has excellent quality (over
cost) but will allow us to still remain competitive.

If you offer SIP termination with low commitments please contact me.

Regards,

Brian
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