End-to-end encrypted with DTLS-SRTP
Audio and video are encrypted with DTLS-SRTP directly between the two phones. Call setup is itself encrypted and signed, so the server cannot place itself in the middle of the call.
A relay that cannot listen
When a direct connection between the phones is not possible, the call goes through a relay. The relay forwards encrypted packets only — it has no keys and cannot open them.
Hide your IP address in calls
A direct call can reveal your IP address to the other person. With “Hide IP in calls” turned on, the call always goes through the relay, so the other person never sees your IP.
Group calls without a server in the middle
In group calls the participants connect to each other directly, so there is no central server mixing everyone’s audio.
No phone number needed
You call people by their Umbera username or quant address. Nobody needs your phone number to reach you.
Frequently asked questions
Are Umbera calls end-to-end encrypted?
Yes. Voice and video calls are encrypted with DTLS-SRTP between the devices, and the keys never leave the phones.
Can the relay server listen to my calls?
No. The relay only forwards encrypted packets and does not have the keys.
Can I make video calls without a phone number?
Yes. Umbera accounts have no phone number; you call people by username or quant address.
Does Umbera support group calls?
Yes. In group calls participants connect to each other directly, with no server in the middle.
Try Umbera
Available on Android and iPhone. The trial is free and starts on first launch — no card required. See exactly what the server can and cannot see on the proof page.