SIPconnect: SIP VoIP Softphone

SIPconnect is a SIP client and VoIP softphone for Android: a WebRTC softphone that registers to FreePBX, Asterisk or any SIP server with secure WebSocket (WSS), plus a SIP field toolkit for the people who install, run and troubleshoot VoIP: PBX admins, telecom techs and power users with their own phone system.

CALLING
• Register to your FreePBX, Asterisk or any SIP server that offers secure WebSocket (WSS) and make calls with Opus or G.711, encrypted with DTLS-SRTP.
• Receive calls while SIPconnect is open, with notifications when it is behind other apps. When the app is closed, your PBX's voicemail and forwarding take over.
• Free: multiple trunks, dialer, provider quick-fill and the FreePBX Quick Connect wizard.
• Pro: in-call keypad (RFC 2833 with SIP INFO fallback), hold, blind and attended transfer, call recording, call waiting, conference, call log with search and CSV export, contacts, block list, voicemail access, speed dials, number rewrite rules, do-not-disturb schedules and full backup and restore.

SET UP IN MINUTES
• FreePBX Quick Connect builds the trunk from your hostname, extension and secret, with a step-by-step server guide (WSS on 8089, WebRTC defaults, certificates, firewall, NAT).
• Provision by QR code or URL.
• Import contacts from vCard, CSV (Google, Outlook) or Excel, or sync with a CardDAV server such as Nextcloud or iCloud.

DIAGNOSTICS (Pro)
• SIP response code lookup with causes and fixes for every code from 100 to 699.
• Codec bandwidth and concurrent-call calculators (Ethernet, PPP, cRTP overhead).
• QoS, DSCP and MOS reference, RTP port and firewall planning, SIP ALG fixes for common routers.
• Engineering references: STIR/SHAKEN attestation, NAT traversal, CNAM, packet capture tips.
• Carrier database with configuration notes for 80+ SIP providers.
• Network quality test: checks that your server is reachable and, over WSS, estimates round-trip time and call quality.

PRIVATE BY DESIGN
• No account and no sign-in. No ads, no analytics, no tracking.
• Trunks, passwords, contacts, call history and recordings stay on your phone. Calls go directly to the phone system you configure, never through our servers.
• The reference tools work offline.

ONE-TIME PURCHASE
SIPconnect Pro is a single one-time purchase through Google Play, with no subscription, that unlocks every Pro calling feature and all diagnostics. It is restored automatically on any phone signed in to the same Google account.

Five themes: Dark, Light, Console, Legacy Bell and Color Blind.

17 languages, including English, Spanish, Portuguese, French and German. SIPconnect follows your phone's language, or choose one in Settings.

Whether you need a SIP phone app for your office PBX, a FreePBX softphone for on-call work or a SIP trunk test client, SIPconnect keeps it in your pocket.

Important: SIPconnect is not a telephone service and is not a replacement for a mobile or landline phone for 911 or other emergency calls. It needs your own SIP provider or PBX with WebRTC (WSS) support.