Same symptoms on Windows 10 Opera 95.0.4635.46 with built-in mic/speakers. Able to send texts and microphone working but no audio during the call. Tried re-installing Opera, disabling extensions, adding voice.google.com to allowed sites etc. but nothing worked until noticing Opera setting called WebRTC set to 'Disable non-proxied UDP'. Changing this setting to 'Use any suitable network interface (recommended)' seemed to fix the problem.

@joshsiddle8 Did you search for WebRTC in the Opera settings to see how it is configured, as mentioned in my previous post?

Same symptoms on Windows 10 Opera 95.0.4635.46 with built-in mic/speakers. Able to send texts and microphone working but no audio during the call. Tried re-installing Opera, disabling extensions, adding voice.google.com to allowed sites etc. but nothing worked until noticing Opera setting called WebRTC set to 'Disable non-proxied UDP'. Changing this setting to 'Use any suitable network interface (recommended)' seemed to fix the problem.