The best alternatives to Next Caller are service., Ringr, and OpenCNAM. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Service finds money in your inbox by checking your eligibility for flight compensation and monitoring hotel price drops. Flight delayed, cancelled or overbooked? Did your hotel rate drop? No problem - with a simple inbox connection we’ll find all the money that you’re owed!
OpenCNAM is a Caller ID API product that features RESTful, SS7/SIGTRAN, ENUM and SIP interfaces making integration simple for any switch, PBX, SIP server or app.