Quote Originally Posted by N9MD View Post
The Comcast problems have mostly been reported in the SouthEast -- rather frequently in Florida. Rather than flagrantly blocking ports, they may simply be "modifying" TCP/RTP packets (whatever that means) which effectively prevents successful functioning of VoIP adapters -- even though, as my prior post indicated, I apparently can register my PAP2 with Comcast but get an "offline" indication (as opposed to "cannont register").

I'll be back in Boca Raton next week and I plan to research the issue with Comcast. (Read that as "I intend to rip them a new one.")
Here is an example of what we're seeing. We'll get the registration request from an ATA, but they strip the login info from it or we'll get a registration request with it redirecting media traffic to another server we don't own.

Not all the time, just basically every time I've had a Comcast problem, it's been one of those. Then later in the day it just starts working again. Side-by-side on DSL, the DSL would have no issues. It's like they are reconstructing the packets and not getting it quite right.