Highly rated open-source and free SIP softphones used for manual configuration. 2022-2023 Configuration Guide
A standard SIP client for Android and iOS. Download 2022mobilis sip
General SIP Device Configuration - Help Center Highly rated open-source and free SIP softphones used
While Mobilis previously offered "SIP" services (like Mobisip ) for making VoIP calls over Wi-Fi, these services have largely transitioned to VoLTE (Voice over LTE) or newer IMS-based systems. Download 2022mobilis sip
These apps allow you to make calls over the internet using SIP credentials:
You need your SIP User ID (often your phone number), Password/Secret, and the Domain/Outbound Proxy provided by your service provider.