The guy who wrote Insomnia sold it - https://yaak.app/blog/yet-another-api-client and ended up writing a new one, https://yaak.app/
Encrypted Calls
All calls are encrypted with TLS 1.2+ for signaling and SRTP with AES-128 for audio. Your conversations stay private during transmission.
This can only be true on your (Voklit) end between the client and the server, it stops being encrypted both from signalling and audio perspective the moment it hits the PSTN in any country on any network.