2N Helios IP Configuration Manual page 79

Video resolution – set the video resolution for phone calls.
Video framerate – set the video frame rate for phone calls.
Video bitrate – set the video stream bit rate for phone calls.
QoS DSCP value – set the video RTP packet priority in the network. The set
value is sent in the TOS (Type of Service) field in the IP packet header.
Maximum packet size – set the size limit for the video RTP packets to be sent.
H.264 payload type (1) – set the payload type for video codec H.264
(packetisation mode 1). Set a value from the range of 96 through 127, or 0 to
disable this codec type.
H.264 payload type (2) – set the payload type for video codec H.264
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