On Wed, 20 Nov 2013, Jay Hennigan wrote:
I haven't run into any blocking, but we're seeing more and more instances where the larger carriers will install some sort of NAT router as the handoff on residential and small business accounts as opposed to giving the customer a DHCP or static public IP.
Many of these devices horribly break SIP, especially if you're putting any kind of ALG behind them.
Getting the carrier to turn off all of the cruft and just give you raw access to the Internet is often an exercise in futility.
We have seen a lot (A WHOLE LOT) of this occurring with Comcast. E.g., we have a client with multiple PBXs spread through about a dozen or so locations throughout CT, RI, MA. At least once per quarter, Comcast seems to push out some form of policy/rule/firmware update or other that prohibits the connection via VoIP and ONLY VoIP. This particular account uses Comcast business however, when this occurs, we get a call from this client, and see the trickle effect via our other clients (ATAs, softphones, etc.) Most other providers we deal with, could care less (Covad, Paetec, AT&T) however the cable providers (which RoadRunner is another) seem to be horrible at this game (filtering). "Getting the carrier..." We try not to inherit any of the network unless we are managing it. This frees us from any liabilities associated with say a Doctors office doing some whacky VPN to a hospital or other. Would take us too long to perform a network assessment, and make sense of a client's business needs, especially for free. -- =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ J. Oquendo SGFA, SGFE, C|EH, CNDA, CHFI, OSCP, CPT, RWSP, GREM "Where ignorance is our master, there is no possibility of real peace" - Dalai Lama 42B0 5A53 6505 6638 44BB 3943 2BF7 D83F 210A 95AF http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x2BF7D83F210A95AF