A portal for my clients to log into and view calls, and listen to calls.
Easy to use interface.
Loads of local phone numbers, even for smaller markets.
I have just started using Call Rail, and so far, so good, but they do have problems getting local numbers in one specific market that I have a number of local clients in (pop 300k).
I know a lot of people use Mongoose Metrics.
What else would you recommend?