unTether is a modern desktop and mobile softphone built on standard SIP. Point it at your existing provider, sign in, and make calls from your computer or phone — no new carrier, no new numbers, no lock-in.
Most VoIP providers hand you a desk phone and a dated app, then charge you to leave. The calling itself is standard — SIP has been an open protocol for decades. The lock-in is the software.
unTether separates the two. It's a clean, fast softphone that speaks standard SIP, so it connects to a wide range of providers rather than tying you to one. Change providers when it makes sense for your business, and keep the app your team already knows.
The first release focuses on doing the fundamentals genuinely well before adding anything else.
Built on SIP and RTP rather than a proprietary protocol, so it works with providers that support standard SIP registration instead of only one vendor's cloud.
The same account, the same contacts, and the same call history on your computer and in your pocket. Take a call at your desk or on the road without changing how you work.
Signaling and media are encrypted in transit using TLS and SRTP where your provider supports it, so calls aren't traveling in the clear.
A softphone should launch instantly, ring reliably, and otherwise stay out of the way. No bloat, no background noise, no surprises during a call.
Searchable contacts, a full call log, and clear voicemail handling — the everyday things people actually reach for a dozen times a day.
Enter your SIP credentials and you're registered. No professional-services engagement required to place a first call.
unTether is actively in development and is not yet generally available. We're building the iOS, Android, and desktop clients now, and we're being deliberate about the first release rather than shipping something half finished.
If you run a business phone system and want to hear when a beta opens — or you're a VoIP provider interested in how unTether would fit alongside your service — we'd like to hear from you.
Questions about the product, partnership inquiries, press, or anything else — email us and a person will read it.