Expanding beyond the narrow "provisioning" term, maybe to help illustrate the who and the whom.
The BES, in my case, is talking to srp.ca.blackberry.net
, which is rim, not carrier, infrastructure. It was this infrastructure that was NOT seeing any traffic from my carrier.
In the ISO standard seven-layer Open Systems Interconnect (OSI) reference model, OSI Model: Definition and additional resources from ZDNet
, the carrier and the device's chipset performs layers 1 through 3, RIM infrastructure performs layers 3 and 4, and the end points (BES and the DEVICE applets) perform layers 6 and 7.
I once had (but cannot re-find to include here) a link that showed this as well as positioning GSM and CDMA in the model.