The best one for me is
Ringba which is the ultimate tracking, reporting, routing, recording, and attribution platform for calls.
Here are just some of the things that this pay per call software allows you to do with Pay Per Call:
Get Tracking Numbers – Get local and toll-free numbers for tracking data and routing calls.
Route Calls to Targets – Create dynamic routing plans for your campaigns for forwarding calls to the best destination.
Manage Call Campaigns – Track, manage and optimize all your call marketing campaigns from a single platform.
Create Custom IVRs (beta) – Build custom IVR trees for qualifying callers and routing them to Targets.
Attribute Traffic Sources – Optimize your campaigns by find your highest converting traffic sources.
Analyze Reports – View detailed call analytics, export reports and work with data in real-time.
I hope you find this hepful!