Tested and supported SIP provider for Cisco UC520 phone system

I am new to VOIP and UC520. We have purchased a UC520 phone system. I am looking for tested and supported SIP provider for the UC520. I have read some of the post and I hear that some are using Cbyound and nexvortex. I guess these are providers that don not require you to use their broadband or T1 lines. I too prefer to not switching use our Comcast 25MB connection, but heard that I may experience issues . Someone also suggested Speakeasy as well.

I hope to hear from some people that HAVE USED the UC520 with SIP trunking.
Thank you for your help,.  
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netcompAsked:
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jfaubiontxConnect With a Mentor Commented:
Teliax was one of our preferred providers for a log time. Here lately they seem to be having growing pains with the back office systems more than anything. Vitelity is a provider that we have been using more of lately. Very few issues and easy to work with. We also like Junction networks for their understanding of "business class" service. A little more expensive but worth the money.

Teliax
Vitelity
Junction Networks
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netcompAuthor Commented:
Jfaubiontx,
Have you used these with the above services with the UC500?
Did you also have to use their highspeed-internet or did you use another ISP  ( i.e Comcast) .
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jfaubiontxCommented:
In all cases we used Time Warner cable modems with 10x1 to 15x2 services. We have used Junction Networks with the UC520.
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