Make audio and video calls in HD.
Send instant messages
Share pictures and files
Make audio and video calls in HD
Create audio conferences
Record and store calls
View real-time presence status
Manage your address book
AJP Telephony Service chosen Linphone to work with.
Linphone is an open source SIP Phone, available on mobile and desktop environments (iOS, Android, GNU/Linux, MAC OSX, Windows Desktop, Windows 10 UWP).