[pulse7]

Quality was not bad, calls didn't drop, no outages, good mobile support. Because it's p2p couldn't be hacked, it was replaced.

[vetinari]

Quality was good and calls didn't drop, but the mobile support was poor. The original design assumed that it can use both cpu time and bandwidth of peers, and that isn't very good for devices on battery and metered data plans.

[mycall]

Maybe if data caps greatly increase with 5G, something p2p like Skype would could be retried.