Possibly worth noting, although completely unverified, RIM may be doing some sort of CAL management and 'call-home' verification. I was told they have the ability to expire CALs (I'll report back at a later date on this), as well. Considering the SRP connection is completely encrypted, you can't really sniff packets to see what's happening on port 3101, so a 'call-home' feature is very much a reality that may or may not be happening behind the scenes.
Regardless, it's something to be open to thinking about. While the general perception of CALs is that they aren't tied to an SRP or they can be re-used multiple times without RIM knowing, this may not be the case. I'm assuming if a 'call-home' feature is enabled with their CALs, then the SRP it's attached to (at that time) can be tracked as well.
Paranoid food for thought.