baresip-core 1.0.0-4build4 (s390x binary) in ubuntu kinetic

 A modular SIP user-agent
 with support for audio and video, and many IETF standards
 such as SIP, SDP, RTP/RTCP, STUN, TURN, ICE, and WebRTC.
 .
 Supports both IPv4 and IPv6, and the following features.
  * Audio codecs: AMR, aptX, EBU ACIP, G.711, G.722, G.726, GSM,
    L16, MPA, OPUS.
  * Video codecs: H.263, H.264, H.265, MPEG4, VP8, VP9.
  * Audio drivers: Alsa, GStreamer, JACK, OSS,
    Portaudio, PulseAudio, sndio.
  * Video sources: FFmpeg avformat, Video4Linux2, X11 Grabber.
  * Video outputs: SDL2, X11, DirectFB.
  * NAT Traversal: STUN, TURN, ICE, NAT-PMP.
  * Media encryption: SRTP, DTLS-SRTP.
  * Telemetry messaging: MQTT.
  * Control interfaces: JSON-over-TCP.
 .
 Some of above features are provided in separate packages
 baresip-gtk, baresip-ffmpeg, baresip-gstreamer and baresip-x11.