Linphone
Easer Smartphone Automation for LineageOS and Android. Example for OpenVPN, SIP Softphone, Nexttracks / Owntracks
BACK On the website there are already many interesting entries for the setup of the Asterisk VoIP telephony with the possibility of keeping the extension on the mobile phone parallel to other extensions.
Read moreProfessional enterprise-grade VoIP telephony with home office and mobile phone support (free, open source)
BACK Telephony has changed even further since I started using Voice over IP (VoIP) in the 1990s.
Read more