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First release in the store: • Calls through your FRITZ!Box via SIP or CAPI, with your landline number • Take calls, even on the lock screen • Encrypted with TLS + SRTP • On the go via VPN to your FRITZ!Box with our app "Router VPN" • Sound warning when you can't be reached • Assistants for IP phone and VPN • Sign out with or without deleting data
Calls through your FRITZ!Box with your landline number – at home and on the go.
Softstringsphone turns your Android phone into a telephone of your FRITZ!Box. Call with your own landline number, get called just like on a cordless phone, and always have the box's call list and phone book with you – at home on Wi-Fi and on the go via the built-in VPN. EVERYTHING ON ONE SCREEN • Dial pad always visible, with recent calls, favourites, the FRITZ!Box call list and phone book, and your phone's contacts above it • Search as you type, by digits or names (T9) • Long-press 0 for "+", paste numbers from the clipboard • "Dial" and phone number links from other apps land in the dial pad TAKE CALLS • Incoming calls ring with ringtone and vibration, full screen even over the lock screen • Missed calls are reported • A sound and a red bar warn you when you can't be reached TWO WAYS TO CALL • SIP: as an IP phone on your FRITZ!Box or directly with a SIP provider • CAPI: quick to set up via the FRITZ!Box CAPI interface on your home network • Hide your number if you like, your own display name over SIP • Emergency numbers 110 and 112 always without prefix code and with your number SECURE • SIP over TLS with certificate checks, voice encrypted with SRTP – a green padlock shows it during the call • Passwords encrypted in the Android keystore • No ads, no account, no data sharing: the app only talks to your FRITZ!Box or your SIP provider ON THE GO LIKE AT HOME • Built-in VPN to your own FRITZ!Box (WireGuard) – choose the box's settings file once, then a switch is all it takes • After a phone restart the VPN comes back on by itself • If the box's internet address changes, the app reconnects EASY SETUP • Step-by-step assistants for the IP phone on the FRITZ!Box and for the VPN, with a test at the end • Try it without a FRITZ!Box: enter "demo" as the address DURING A CALL • Mute, speaker, keypad (DTMF), call duration • The proximity sensor turns the screen off at your ear • Light, dark, German and English, phone and tablet REQUIREMENTS • A FRITZ!Box with telephony – or any SIP account • For CAPI: CAPI over TCP enabled on the box (dial #96*3* on a phone) • On the go with the FRITZ!Box: the box's WireGuard VPN (FRITZ!OS 7.50 or later) For emergency calls, your phone's mobile network is the more reliable route. FRITZ!Box is a trademark of FRITZ! GmbH. Softstringsphone is an independent project by Maikstrings and not a product of FRITZ! GmbH.