I agree with Brandon on the modem/router/wireless combo devices that you typically deal with in residential scenarios. For example, I have internet service from a large, well-known provider and I used Lingo for about 4 years. Prior to that, I tested multiple VoIP providers at home to finally decide upon Lingo. Long story short, I had little control over the built-in firewall/security functions of the wireless/combo switch/router and it was interesting that with no configuration changes my provider's VoIP services worked without issue (same for Vonage). However, for Lingo and a couple other providers (Packet 8) - I had to put in hokie port forwarding rules to get the services to work. So, there is always a variable there.
As for Comcast, I won't get that discussion as opinions on providers vary on many levels. The most important thing is to know or be able to gather enough information to feel relatively certain that user's home networks are typically stable. For example, if provider X has a reputation for going in/out but provider Y has a reputation for always being available - one could deduce that provider Y may have a better chance of providing the type of end user experience customers wants. However, there are many factors that determine what provider is available at someone's residence - in many cases, there is only one choice, whereas in others - you have pick of the litter.
Just my 2 cents.
Hailey
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