Quote from: steven.rogers.091 on September 28, 2018, 02:18:06 PM

What purpose does the blockchain have in your project? Shocked

They already have answered this.
The USPs of moving a part of the process on blockchain are as follows:

Instant and low-cost payment: The use of Ethereum blockchain enables faster and cheaper payments as compared to traditional banking or payment gateway methods
Freeze wallet: Smart contract on blockchain blocks all the money in the callers wallet once he initiates a call so that he cannot use the same money elsewhere. Authorization by both parties private key happens every second automatically
No financial dispute: When a caller initiates a call, Smart contract on the backend is invoked. It captures callers & receivers information such as availability, call rate, account balance etc & auto-debits the callers wallet at the end of the call based on proof of work. This ensures a seamless financial settlement
No legal dispute: Decentralized nature of blockchain ensures security; the data saved on the blockchain cannot be tampered or leaked after the call and no editing is allowed in users account settings during the call. This ensures a dispute-free platform.