CallnFax Softphone

CallnFax Softphone is a SIP-based VoIP application designed for CallnFax customers to make and receive internet phone calls securely from their Android device.

The app uses Android’s foreground service (phoneCall and microphone types) to maintain active VoIP call sessions and ensure reliable incoming call notifications, even when the app is in the background or the device is locked. This is required for proper telephony functionality and uninterrupted communication.

Key features include:
• Secure SIP authentication
• High-quality VoIP calling
• Background incoming call support
• Business communication tools

This app is intended for existing CallnFax customers and requires an active account.

This app is Free of Charge, the service from CallnFax is a paid service in addition to this app.