2N Helios IP User manual, 1510 v1.13 - Manual (Page 87)

Configuration 3.3
87
Video Codec Settings
Video resolution
Set the picture formats of the video transmitted. The resolution values range from
QCIF (176x144) to VGA (640×480).
Frame rate
Set the frame rate for frames to be sent by 2N ® Helios IP to the VoIP network.
Video bit rate
Set the transmission rate for video transmission from 2N ® Helios IP. The lower the
bit rate the greater picture compression is necessary. This results in a lower
picture quality on the receiving end. A high bit rate does not have to mean
significant improvement of transmission as a whole because the network may get
overloaded, resulting in a greater packet loss rate or delay.
Video packet size
Set how large the video transmitting packet should be.
Quality Settings
QoS DSCP for video
Set the priority of the video transmitting packets in the network. The value is
copied into the ToS (Type of Service) field in the IP packet header.
Caution
 Wrong settings may deteriorate the transfer quality. Do not change this
parameter if you are not sure. The change in the transfer quality will show
only in case the network components support this service.
Advanced RTP Settings
RTP payload type
Set the Media Format value of the Media attribute (a) in the SPD part of the
INVITE message. Some SIP proxies require this value for a successful video call
set-up. If 0 is selected, the given RTP payload type is not used. It is necessary to
disable one RTP payload type in some SIP proxies, e.g. the Cisco Call Manager.
Caution
 Wrong settings may result in a loss of network compatibility. Do not
change this parameter if you are not sure. Losing network compatibility
may cause video transmission errors.