属于 "stretch-backports" 发行版 comm 子版面的软件包

picocom (3.1-2~bpo9+1)
minimal dumb-terminal emulation program
ring (20171129.2.cf5bbff~ds1-1~bpo9+2)
Secure and distributed voice, video and chat platform - desktop client
ring-daemon (20171129.2.cf5bbff~ds1-1~bpo9+2)
Secure and distributed voice, video and chat platform - daemon