OS: CentOS 7.2; MCU: 3.2; Polycom: HDX 8000 and RealPresence Group 550
No Gateway: 1) Polycom calls MCU via SIP account; 2) Both ends see and hear other other; 3) The polycom's video input always freezes after 1 second; 4) Both sides Audios always work, webrtc client's video input always work.
With Gateway: Same as above.
SIP calls with jitsi is OK.
Please see attached for Logs.