Pardon my stupidity, but I am a little stumped on which one to use. We have a client with a UC500 wanting teleworker at his home with up to 3 or 4 phones. I have seen different pros and cons for this but which is the best, easiest to implement and manage solution? Is the SA 500 to replace the SR520 series or do most people still use 870 ISR's? The ASA is just thrown in there as another option.