YAPET.DEV / PROJECTS / TELLVO.APP
Tellvo.app.
Your work extension and your own SIP number on one iPhone, ringing like regular calls. No account, no ads, no tracking.
WHAT IT SOLVES
A SIP number usually lives on a desk phone or in a softphone that looks like a telecom control panel. This one works with any SIP provider or office phone system and makes those calls behave like the iPhone's own — the call screen, Recents, the Lock Screen, CarPlay, AirPods. And because SIP settings are miserable to type on a phone, you type them on a computer instead.
WHAT IT DOES
Many lines, one keypadWork and personal side by side. Pick the line above the keypad; a green dot says it is online.
Calls that look like callsCallKit gives an internet call the system call screen, Recents, Focus, CarPlay and AirPods — nothing new to learn.
Hold, swap, merge, step outJuggle two calls, merge them into three-way, or connect the two callers and leave. Codec, delay and loss are one glance away.
Set up from your computerOpen setup.tellvo.app, scan the QR code or type six digits. The iPhone follows every keystroke and tests the line; the link between them is end-to-end encrypted.
Rings with the app closedAn optional push service keeps your line registered and wakes the iPhone for each incoming call. Voice never passes through it; passwords otherwise stay in the iPhone Keychain.
BUILT WITH
iOS 17+Any SIP providerCallKit · CarPlayTLS + SRTPOpus · G.722
WHERE IT LIVES