Blancco Secure Data Eraser - Blancco Secure Data Eraser is a user-friendly software that is designed to top leading organizations of all sizes to safely resell, respond or dispose of drives when they have reached end-of-life for security, compliance, and CSR purposes.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Wondershare dr.fone Data Eraser - Factory reset your phone isn't enough. Dr.Fone - Android Data Eraser helps completely erase everything on your Android phone and protect your privacy.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Shreddit - Data Eraser - Shreddit is a data eraser app that effectively deletes confidential data from your Android device.
Sipdroid - Free and open-source SIP/VoIP Client