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Sipdroid - Free and open-source SIP/VoIP Client
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.