User manual, 1510 v1.13 Owner's manual

Configuration

3.3

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.