Tried calling from both Jami and Linphone on my phone. Linphone tells me in audio form that the number is currently unavailable when I accept the call on Linux. Jami just says “Missed outgoing call” in chat. Calling from Linux to android works fine.
Does the Linux version of Jami support SRTP? If yes, why else would it not be working?
SRTP supported, so probably not the problem. If you can initiate **SIP** calls but not receive them, check that your SIP account is still registered, and check for NAT/firewall or Flathub sandbox issues. The debug logs should tell if it’s a registration problem or a regression in that Linux build.