Yes,

When SIP7 went down the other day, I had to move a bunch of customers over to the main SIP server.

Then, I spent most of yesterday answering support calls and moving those same customers back to SIP7, which didn't seem to suffer from whatever issue SIP was having.

Unfortunately, I really don't have the tools, knowledge or access to do much more than guess what is happening.

So the following are just some basic observations and guesses.

It seems it is mostly Comcast customers who have issues with the SIP server. A few customers using Charter, Cox and Time Warner have also had issues with SIP. I have even had one or two Verizon Fios customers who've had issue with SIP server.

And of course, not all customers using these ISPs have trouble with SIP server. However, for those that do have trouble, moving to SIP7 works like a charm (except when it went down completely the other day).

It may be coincidence, but I believe most of those ISPs use Level3 for their backbone connections. That makes me wonder if the SIP data center has some weird route to Level3. SIP7 being in a different data center, hosted by a totally different company, could potentially have a better route.

Or, it could simply be something different that voipo is doing (or not doing) at SIP7 that makes it work better.

I will say this. Other than when SIP7 went down completely the other day, I've never had a setup that wouldn't work perfectly on SIP7.

Again, hard to know what is up from the outside, but there is absolutely a difference between SIP and SIP7.